]> git.lyx.org Git - lyx.git/blobdiff - src/frontends/qt4/GuiApplication.cpp
Skip paint event when in the middle of a buffer operation
[lyx.git] / src / frontends / qt4 / GuiApplication.cpp
index 916f0a4e1438a707ff96e42e3d1f148ba2c8052b..93eb2e86ecded8a82771a7f6b02aa3dc585464d8 100644 (file)
 
 #include "GuiApplication.h"
 
+#include "ToolTipFormatter.h"
 #include "ColorCache.h"
 #include "ColorSet.h"
 #include "GuiClipboard.h"
-#include "GuiImage.h"
 #include "GuiKeySymbol.h"
 #include "GuiSelection.h"
 #include "GuiView.h"
 
 #include "Buffer.h"
 #include "BufferList.h"
+#include "BufferParams.h"
 #include "BufferView.h"
 #include "CmdDef.h"
 #include "Color.h"
+#include "Converter.h"
+#include "CutAndPaste.h"
+#include "ErrorList.h"
 #include "Font.h"
 #include "FuncRequest.h"
 #include "FuncStatus.h"
 #include "Thesaurus.h"
 #include "version.h"
 
+#include "insets/InsetText.h"
+
 #include "support/convert.h"
 #include "support/debug.h"
 #include "support/ExceptionMessage.h"
 #include "support/FileName.h"
 #include "support/filetools.h"
-#include "support/foreach.h"
 #include "support/ForkedCalls.h"
 #include "support/gettext.h"
 #include "support/lassert.h"
 #include "support/lstrings.h"
 #include "support/lyxalgo.h" // sorted
+#include "support/textutils.h"
 #include "support/Messages.h"
 #include "support/os.h"
 #include "support/Package.h"
-#include "support/PathChanger.h"
-#include "support/Systemcall.h"
+#include "support/TempFile.h"
 
-#ifdef Q_WS_MACX
+#ifdef Q_OS_MAC
 #include "support/AppleScript.h"
 #include "support/linkback/LinkBackProxy.h"
 #endif
 
 #include <queue>
 
+#include <QFontDatabase>
 #include <QByteArray>
 #include <QClipboard>
 #include <QDateTime>
+#include <QDesktopWidget>
 #include <QDir>
 #include <QEvent>
 #include <QEventLoop>
 #ifdef Q_WS_X11
 #include <X11/Xatom.h>
 #include <X11/Xlib.h>
+#include <QX11Info>
 #undef CursorShape
 #undef None
+#elif defined(QPA_XCB)
+#include <xcb/xcb.h>
+#ifdef HAVE_QT5_X11_EXTRAS
+#include <QtX11Extras/QX11Info>
+#endif
 #endif
 
-#ifdef Q_WS_WIN
+#if (QT_VERSION < 0x050000) || (QT_VERSION >= 0x050400)
+#if defined(Q_OS_WIN) || defined(Q_CYGWIN_WIN)
+#if (QT_VERSION < 0x050000)
 #include <QWindowsMime>
+#define QWINDOWSMIME QWindowsMime
+#else
+#include <QWinMime>
+#define QWINDOWSMIME QWinMime
+#endif
 #ifdef Q_CC_GNU
 #include <wtypes.h>
 #endif
 #include <objidl.h>
-#endif // Q_WS_WIN
+#endif
+#endif
 
-#ifdef Q_WS_MACX
+#ifdef Q_OS_MAC
 #include <QMacPasteboardMime>
-#endif // Q_WS_MACX
+#endif // Q_OS_MAC
 
-#include "support/bind.h"
 #include <boost/crc.hpp>
 
 #include <exception>
@@ -155,7 +175,7 @@ namespace lyx {
 
 frontend::Application * createApplication(int & argc, char * argv[])
 {
-#ifndef Q_WS_X11
+#if !defined(Q_WS_X11) && !defined(QPA_XCB)
        // prune -geometry argument(s) by shifting
        // the following ones 2 places down.
        for (int i = 0 ; i < argc ; ++i) {
@@ -168,6 +188,12 @@ frontend::Application * createApplication(int & argc, char * argv[])
                }
        }
 #endif
+
+#if defined(Q_OS_WIN) || defined(Q_CYGWIN_WIN)
+       // On Windows, allow bringing the LyX window to top
+       AllowSetForegroundWindow(ASFW_ANY);
+#endif
+
        frontend::GuiApplication * guiApp = new frontend::GuiApplication(argc, argv);
        // I'd rather do that in the constructor, but I do not think that
        // the palette is accessible there.
@@ -179,14 +205,15 @@ frontend::Application * createApplication(int & argc, char * argv[])
 void setLocale()
 {
        QLocale theLocale;
+       string code;
        if (lyxrc.gui_language == "auto") {
                theLocale = QLocale::system();
+               code = fromqstr(theLocale.name());
        } else {
                Language const * l = languages.getLanguage(lyxrc.gui_language);
-               string const code = l ? l->code() : string();
+               code = l ? l->code() : "C";
                theLocale = QLocale(toqstr(code));
        }
-       string const code = fromqstr(theLocale.name());
        // Qt tries to outsmart us and transforms en_US to C.
        Messages::guiLanguage((code == "C") ? "en_US" : code);
        QLocale::setDefault(theLocale);
@@ -210,14 +237,35 @@ vector<string> loadableImageFormats()
        if (qt_formats.empty())
                LYXERR(Debug::GRAPHICS, "\nQt4 Problem: No Format available!");
 
+       bool jpeg_found = false;
+       bool jpg_found = false;
        for (QList<QByteArray>::const_iterator it = qt_formats.begin(); it != qt_formats.end(); ++it) {
 
                LYXERR(Debug::GRAPHICS, (const char *) *it << ", ");
 
                string ext = ascii_lowercase((const char *) *it);
                // special case
-               if (ext == "jpeg")
+               if (ext == "jpeg") {
+                       jpeg_found = true;
+                       if (jpg_found)
+                               continue;
                        ext = "jpg";
+               }
+               else if (ext == "jpg") {
+                       jpg_found = true;
+                       if (jpeg_found)
+                               continue;
+               }
+               else if (lyxrc.use_converter_cache &&
+                        (ext == "svg" || ext == "svgz") &&
+                         theConverters().isReachable("svg", "png"))
+                       // Qt only supports SVG 1.2 tiny. See #9778. We prefer displaying
+                       // the SVG as in the output. However we require that the converter
+                       // cache is enabled since this is expensive. We also require that
+                       // an explicit svg->png converter is defined, since the default
+                       // converter could produce bad quality as well. This assumes that
+                       // png can always be loaded.
+                       continue;
                fmts.push_back(ext);
        }
 
@@ -233,13 +281,13 @@ vector<string> loadableImageFormats()
 
 namespace {
 
-struct PngMap {
+struct ImgMap {
        QString key;
        QString value;
 };
 
 
-bool operator<(PngMap const & lhs, PngMap const & rhs)
+bool operator<(ImgMap const & lhs, ImgMap const & rhs)
 {
        return lhs.key < rhs.key;
 }
@@ -248,7 +296,7 @@ bool operator<(PngMap const & lhs, PngMap const & rhs)
 class CompareKey {
 public:
        CompareKey(QString const & name) : name_(name) {}
-       bool operator()(PngMap const & other) const { return other.key == name_; }
+       bool operator()(ImgMap const & other) const { return other.key == name_; }
 private:
        QString const name_;
 };
@@ -258,7 +306,7 @@ private:
 // Upper case comes before lower case
 // Please don't change the formatting, this list is parsed by
 // development/tools/generate_symbols_images.py.
-PngMap sorted_png_map[] = {
+ImgMap sorted_img_map[] = {
        { "Arrownot", "arrownot2"},
        { "Arrowvert", "arrowvert2"},
        { "Bowtie", "bowtie2" },
@@ -327,12 +375,16 @@ PngMap sorted_png_map[] = {
        { "XBox", "xbox3" },
        { "Xbox", "xbox2" },
        { "Xi", "xi2" },
+       { "lVert", "vert2" },
+       { "lvert", "vert" },
        { "nLeftarrow", "nleftarrow2" },
        { "nLeftrightarrow", "nleftrightarrow2" },
        { "nRightarrow", "nrightarrow2" },
        { "nVDash", "nvdash3" },
        { "nVdash", "nvdash4" },
        { "nvDash", "nvdash2" },
+       { "rVert", "vert2" },
+       { "rvert", "vert" },
        { "textrm \\AA", "textrm_AA"},
        { "textrm \\O", "textrm_O"},
        { "vDash", "vdash2" },
@@ -350,17 +402,16 @@ PngMap sorted_png_map[] = {
 };
 
 
-size_t const nr_sorted_png_map = sizeof(sorted_png_map) / sizeof(PngMap);
+size_t const nr_sorted_img_map = sizeof(sorted_img_map) / sizeof(ImgMap);
 
 // This list specifies which system's theme icon is related to which lyx
 // command. It was based on:
 // http://standards.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html
 // this must be sorted alphabetically
 // Upper case comes before lower case
-PngMap sorted_theme_icon_map[] = {
+ImgMap sorted_theme_icon_map[] = {
        { "bookmark-goto 0", "go-jump" },
        { "buffer-new", "document-new" },
-       { "buffer-print", "document-print" },
        { "buffer-write", "document-save" },
        { "buffer-write-as", "document-save-as" },
        { "buffer-zoom-in", "zoom-in" },
@@ -369,7 +420,6 @@ PngMap sorted_theme_icon_map[] = {
        { "cut", "edit-cut" },
        { "depth-decrement", "format-indent-less" },
        { "depth-increment", "format-indent-more" },
-       { "dialog-show print", "document-print" },
        { "dialog-show spellchecker", "tools-check-spelling" },
        { "dialog-show-new-inset graphics", "insert-image" },
        { "dialog-toggle findreplaceadv", "edit-find-replace" },
@@ -386,54 +436,54 @@ PngMap sorted_theme_icon_map[] = {
        { "window-new", "window-new" }
 };
 
-size_t const nr_sorted_theme_icon_map = sizeof(sorted_theme_icon_map) / sizeof(PngMap);
+size_t const nr_sorted_theme_icon_map = sizeof(sorted_theme_icon_map) / sizeof(ImgMap);
 
 
-QString findPng(QString const & name)
+QString findImg(QString const & name)
 {
-       PngMap const * const begin = sorted_png_map;
-       PngMap const * const end = begin + nr_sorted_png_map;
+       ImgMap const * const begin = sorted_img_map;
+       ImgMap const * const end = begin + nr_sorted_img_map;
        LATTEST(sorted(begin, end));
 
-       PngMap const * const it = find_if(begin, end, CompareKey(name));
+       ImgMap const * const it = find_if(begin, end, CompareKey(name));
 
-       QString png_name;
+       QString img_name;
        if (it != end) {
-               png_name = it->value;
+               img_name = it->value;
        } else {
-               png_name = name;
-               png_name.replace('_', "underscore");
-               png_name.replace(' ', '_');
+               img_name = name;
+               img_name.replace('_', "underscore");
+               img_name.replace(' ', '_');
 
                // This way we can have "math-delim { }" on the toolbar.
-               png_name.replace('(', "lparen");
-               png_name.replace(')', "rparen");
-               png_name.replace('[', "lbracket");
-               png_name.replace(']', "rbracket");
-               png_name.replace('{', "lbrace");
-               png_name.replace('}', "rbrace");
-               png_name.replace('|', "bars");
-               png_name.replace(',', "thinspace");
-               png_name.replace(':', "mediumspace");
-               png_name.replace(';', "thickspace");
-               png_name.replace('!', "negthinspace");
+               img_name.replace('(', "lparen");
+               img_name.replace(')', "rparen");
+               img_name.replace('[', "lbracket");
+               img_name.replace(']', "rbracket");
+               img_name.replace('{', "lbrace");
+               img_name.replace('}', "rbrace");
+               img_name.replace('|', "bars");
+               img_name.replace(',', "thinspace");
+               img_name.replace(':', "mediumspace");
+               img_name.replace(';', "thickspace");
+               img_name.replace('!', "negthinspace");
        }
 
-       LYXERR(Debug::GUI, "findPng(" << name << ")\n"
-               << "Looking for math PNG called \"" << png_name << '"');
-       return png_name;
+       LYXERR(Debug::GUI, "findImg(" << name << ")\n"
+               << "Looking for math icon called \"" << img_name << '"');
+       return img_name;
 }
 
-} // namespace anon
+} // namespace
 
 
 QString themeIconName(QString const & action)
 {
-       PngMap const * const begin = sorted_theme_icon_map;
-       PngMap const * const end = begin + nr_sorted_theme_icon_map;
+       ImgMap const * const begin = sorted_theme_icon_map;
+       ImgMap const * const end = begin + nr_sorted_theme_icon_map;
        LASSERT(sorted(begin, end), /**/);
 
-       PngMap const * const it = find_if(begin, end, CompareKey(action));
+       ImgMap const * const it = find_if(begin, end, CompareKey(action));
 
        if (it != end)
                return it->value;
@@ -451,13 +501,13 @@ QString iconName(FuncRequest const & f, bool unknown)
        case LFUN_MATH_INSERT:
                if (!f.argument().empty()) {
                        path = "math/";
-                       name1 = findPng(toqstr(f.argument()).mid(1));
+                       name1 = findImg(toqstr(f.argument()).mid(1));
                }
                break;
        case LFUN_MATH_DELIM:
        case LFUN_MATH_BIGDELIM:
                path = "math/";
-               name1 = findPng(toqstr(f.argument()));
+               name1 = findImg(toqstr(f.argument()));
                break;
        case LFUN_CALL:
                path = "commands/";
@@ -468,24 +518,9 @@ QString iconName(FuncRequest const & f, bool unknown)
                docstring firstcom;
                docstring dummy = split(f.argument(), firstcom, ';');
                name1 = toqstr(firstcom);
-               // FIXME: we should rename the icons to tabular-xxx instead of
-               // "tabular-feature-xxx"
-               name1.replace("inset-modify tabular", "tabular-feature");
                name1.replace(' ', '_');
                break;
        }
-       case LFUN_INSET_MODIFY: {
-               // FIXME: we should rename the icons to tabular-xxx instead of
-               // "tabular-feature-xxx" and generalize this naming to all
-               // insets, not to tabular using ones.
-               string inset_name;
-               string const command = split(to_utf8(f.argument()), inset_name, ' ');
-               if (insetCode(inset_name) == TABULAR_CODE) {
-                       name1 = "tabular-feature "+ toqstr(command);
-                       name1.replace(' ', '_');
-                       break;
-               }
-       }
        default:
                name2 = toqstr(lyxaction.getActionName(f.action()));
                name1 = name2;
@@ -499,13 +534,14 @@ QString iconName(FuncRequest const & f, bool unknown)
 
        QStringList imagedirs;
        imagedirs << "images/" << "images/ipa/";
-       for (int i = 0; i < imagedirs.size(); ++i) { 
+       search_mode mode = theGuiApp()->imageSearchMode();
+       for (int i = 0; i < imagedirs.size(); ++i) {
                QString imagedir = imagedirs.at(i) + path;
-               FileName fname = imageLibFileSearch(imagedir, name1, "png");
+               FileName fname = imageLibFileSearch(imagedir, name1, "svgz,png", mode);
                if (fname.exists())
                        return toqstr(fname.absFileName());
 
-               fname = imageLibFileSearch(imagedir, name2, "png");
+               fname = imageLibFileSearch(imagedir, name2, "svgz,png", mode);
                if (fname.exists())
                        return toqstr(fname.absFileName());
        }
@@ -516,65 +552,84 @@ QString iconName(FuncRequest const & f, bool unknown)
                LYXERR0("Directory " << path << " not found in resource!");
                return QString();
        }
-       name1 += ".png";
-       if (res.exists(name1))
-               return path + name1;
+       if (res.exists(name1 + ".svgz"))
+               return path + name1 + ".svgz";
+       else if (res.exists(name1 + ".png"))
+               return path + name1 + ".png";
 
-       name2 += ".png";
-       if (res.exists(name2))
-               return path + name2;
+       if (res.exists(name2 + ".svgz"))
+               return path + name2 + ".svgz";
+       else if (res.exists(name2 + ".png"))
+               return path + name2 + ".png";
 
        LYXERR(Debug::GUI, "Cannot find icon with filename "
-                          << "\"" << name1 << "\""
+                          << "\"" << name1 << ".{svgz,png}\""
                           << " or filename "
-                          << "\"" << name2 << "\""
+                          << "\"" << name2 << ".{svgz,png}\""
                           << " for command \""
                           << lyxaction.getActionName(f.action())
                           << '(' << to_utf8(f.argument()) << ")\"");
 
        if (unknown) {
                QString imagedir = "images/";
-               FileName fname = imageLibFileSearch(imagedir, "unknown", "png");
+               FileName fname = imageLibFileSearch(imagedir, "unknown", "svgz,png", mode);
                if (fname.exists())
                        return toqstr(fname.absFileName());
-               return QString(":/images/unknown.png");
+               return QString(":/images/unknown.svgz");
        }
 
        return QString();
 }
 
+
+bool getPixmap(QPixmap & pixmap, QString const & path)
+{
+       return pixmap.load(path);
+}
+
+
 QPixmap getPixmap(QString const & path, QString const & name, QString const & ext)
 {
-       QPixmap pixmap;
        QString imagedir = path;
-       FileName fname = imageLibFileSearch(imagedir, name, ext);
-       QString path1 = toqstr(fname.absFileName());
-       QString path2 = ":/" + path + name + "." + ext;
+       FileName fname = imageLibFileSearch(imagedir, name, ext, theGuiApp()->imageSearchMode());
+       QString fpath = toqstr(fname.absFileName());
+       QPixmap pixmap = QPixmap();
 
-       if (pixmap.load(path1)) {
+       if (getPixmap(pixmap, fpath)) {
                return pixmap;
        }
-       else if (pixmap.load(path2)) {
-               return pixmap;
+
+       QStringList exts = ext.split(",");
+       fpath = ":/" + path + name + ".";
+       for (int i = 0; i < exts.size(); ++i) {
+               if (getPixmap(pixmap, fpath + exts.at(i))) {
+                       return pixmap;
+               }
        }
 
+       bool const list = ext.contains(",");
        LYXERR0("Cannot load pixmap \""
-               << path << name << '.' << ext
-               << "\", please verify resource system!");
+               << path << name << "." << (list ? "{" : "") << ext
+               << (list ? "}" : "") << "\", please verify resource system!");
 
        return QPixmap();
 }
 
+
 QIcon getIcon(FuncRequest const & f, bool unknown)
 {
 #if (QT_VERSION >= 0x040600)
        if (lyxrc.use_system_theme_icons) {
+               // use the icons from system theme that are available
                QString action = toqstr(lyxaction.getActionName(f.action()));
                if (!f.argument().empty())
                        action += " " + toqstr(f.argument());
                QString const theme_icon = themeIconName(action);
-               if (QIcon::hasThemeIcon(theme_icon))
-                       return QIcon::fromTheme(theme_icon);
+               if (QIcon::hasThemeIcon(theme_icon)) {
+                       QIcon const thmicn = QIcon::fromTheme(theme_icon);
+                       if (!thmicn.isNull())
+                               return thmicn;
+               }
        }
 #endif
 
@@ -583,13 +638,13 @@ QIcon getIcon(FuncRequest const & f, bool unknown)
                return QIcon();
 
        //LYXERR(Debug::GUI, "Found icon: " << icon);
-       QPixmap pm;
-       if (!pm.load(icon)) {
+       QPixmap pixmap = QPixmap();
+       if (!getPixmap(pixmap,icon)) {
                LYXERR0("Cannot load icon " << icon << " please verify resource system!");
                return QIcon();
        }
 
-       return QIcon(pm);
+       return QIcon(pixmap);
 }
 
 
@@ -626,9 +681,15 @@ public:
                : QTranslator(parent)
        {}
 
+#if QT_VERSION >= 0x050000
+       virtual QString translate(const char * /* context */,
+               const char *sourceText,
+               const char * /* disambiguation */ = 0, int /* n */ = -1) const
+#else
        QString translate(const char * /*context*/,
          const char * sourceText,
          const char * /*comment*/ = 0) const
+#endif
        {
                string const s = sourceText;
                if (s == N_("About %1") || s == N_("Preferences")
@@ -639,29 +700,7 @@ public:
        }
 };
 
-class GlobalMenuBar : public QMenuBar
-{
-public:
-       ///
-       GlobalMenuBar() : QMenuBar(0) {}
-
-       ///
-       bool event(QEvent * e)
-       {
-               if (e->type() == QEvent::ShortcutOverride) {
-                       //          && activeWindow() == 0) {
-                       QKeyEvent * ke = static_cast<QKeyEvent*>(e);
-                       KeySymbol sym;
-                       setKeySymbol(&sym, ke);
-                       guiApp->processKeySym(sym, q_key_state(ke->modifiers()));
-                       e->accept();
-                       return true;
-               }
-               return false;
-       }
-};
-
-#ifdef Q_WS_MACX
+#ifdef Q_OS_MAC
 // QMacPasteboardMimeGraphics can only be compiled on Mac.
 
 class QMacPasteboardMimeGraphics : public QMacPasteboardMime
@@ -721,7 +760,8 @@ public:
 ////////////////////////////////////////////////////////////////////////
 // Windows specific stuff goes here...
 
-#ifdef Q_WS_WIN
+#if (QT_VERSION < 0x050000) || (QT_VERSION >= 0x050400)
+#if defined(Q_OS_WIN) || defined(Q_CYGWIN_WIN)
 // QWindowsMimeMetafile can only be compiled on Windows.
 
 static FORMATETC cfFromMime(QString const & mimetype)
@@ -741,12 +781,12 @@ static FORMATETC cfFromMime(QString const & mimetype)
 }
 
 
-class QWindowsMimeMetafile : public QWindowsMime {
+class QWindowsMimeMetafile : public QWINDOWSMIME {
 public:
        QWindowsMimeMetafile() {}
 
-       bool canConvertFromMime(FORMATETC const & formatetc,
-               QMimeData const * mimedata) const
+       bool canConvertFromMime(FORMATETC const & /*formatetc*/,
+               QMimeData const * /*mimedata*/) const
        {
                return false;
        }
@@ -760,14 +800,14 @@ public:
                return pDataObj->QueryGetData(&formatetc) == S_OK;
        }
 
-       bool convertFromMime(FORMATETC const & formatetc,
-               const QMimeData * mimedata, STGMEDIUM * pmedium) const
+       bool convertFromMime(FORMATETC const & /*formatetc*/,
+               const QMimeData * /*mimedata*/, STGMEDIUM * /*pmedium*/) const
        {
                return false;
        }
 
        QVariant convertToMime(QString const & mimetype, IDataObject * pDataObj,
-               QVariant::Type preferredType) const
+               QVariant::Type /*preferredType*/) const
        {
                QByteArray data;
                if (!canConvertToMime(mimetype, pDataObj))
@@ -798,7 +838,7 @@ public:
 
 
        QVector<FORMATETC> formatsForMime(QString const & mimetype,
-               QMimeData const * mimedata) const
+               QMimeData const * /*mimedata*/) const
        {
                QVector<FORMATETC> formats;
                if (mimetype == emfMimeType() || mimetype == wmfMimeType())
@@ -818,7 +858,8 @@ public:
        }
 };
 
-#endif // Q_WS_WIN
+#endif
+#endif
 
 
 /// Allows to check whether ESC was pressed during a long operation
@@ -882,9 +923,11 @@ struct GuiApplication::Private
        Private(): language_model_(0), meta_fake_bit(NoModifier),
                global_menubar_(0)
        {
-       #ifdef Q_WS_WIN
+       #if (QT_VERSION < 0x050000) || (QT_VERSION >= 0x050400)
+       #if defined(Q_OS_WIN) || defined(Q_CYGWIN_WIN)
                /// WMF Mime handler for Windows clipboard.
                wmf_mime_ = new QWindowsMimeMetafile;
+       #endif
        #endif
                initKeySequences(&theTopLevelKeymap());
        }
@@ -930,6 +973,9 @@ struct GuiApplication::Private
        ///
        KeyModifier meta_fake_bit;
 
+       /// The result of last dispatch action
+       DispatchResult dispatch_result_;
+
        /// Multiple views container.
        /**
        * Warning: This must not be a smart pointer as the destruction of the
@@ -939,16 +985,18 @@ struct GuiApplication::Private
        QHash<int, GuiView *> views_;
 
        /// Only used on mac.
-       GlobalMenuBar * global_menubar_;
+       QMenuBar * global_menubar_;
 
-#ifdef Q_WS_MACX
+#ifdef Q_OS_MAC
        /// Linkback mime handler for MacOSX.
        QMacPasteboardMimeGraphics mac_pasteboard_mime_;
 #endif
 
-#ifdef Q_WS_WIN
+#if (QT_VERSION < 0x050000) || (QT_VERSION >= 0x050400)
+#if defined(Q_OS_WIN) || defined(Q_CYGWIN_WIN)
        /// WMF Mime handler for Windows clipboard.
        QWindowsMimeMetafile * wmf_mime_;
+#endif
 #endif
 
        /// Allows to check whether ESC was pressed during a long operation
@@ -960,7 +1008,7 @@ GuiApplication * guiApp;
 
 GuiApplication::~GuiApplication()
 {
-#ifdef Q_WS_MACX
+#ifdef Q_OS_MAC
        closeAllLinkBackLinks();
 #endif
        delete d;
@@ -975,12 +1023,20 @@ GuiApplication::GuiApplication(int & argc, char ** argv)
        QCoreApplication::setOrganizationName(app_name);
        QCoreApplication::setOrganizationDomain("lyx.org");
        QCoreApplication::setApplicationName(lyx_package);
+#if QT_VERSION >= 0x050000
+       QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
+#endif
 
        qsrand(QDateTime::currentDateTime().toTime_t());
 
        // Install translator for GUI elements.
        installTranslator(&d->qt_trans_);
 
+#ifdef QPA_XCB
+       // Enable reception of XCB events.
+       installNativeEventFilter(this);
+#endif
+
        // FIXME: quitOnLastWindowClosed is true by default. We should have a
        // lyxrc setting for this in order to let the application stay resident.
        // But then we need some kind of dock icon, at least on Windows.
@@ -988,7 +1044,7 @@ GuiApplication::GuiApplication(int & argc, char ** argv)
        if (lyxrc.quit_on_last_window_closed)
                setQuitOnLastWindowClosed(false);
        */
-#ifdef Q_WS_MACX
+#ifdef Q_OS_MAC
        // FIXME: Do we need a lyxrc setting for this on Mac? This behaviour
        // seems to be the default case for applications like LyX.
        setQuitOnLastWindowClosed(false);
@@ -997,10 +1053,10 @@ GuiApplication::GuiApplication(int & argc, char ** argv)
        /// Only needed with Qt/Mac.
        installTranslator(new MenuTranslator(this));
        ///
-    setupApplescript();
+       setupApplescript();
 #endif
 
-#ifdef Q_WS_X11
+#if defined(Q_WS_X11) || defined(QPA_XCB)
        // doubleClickInterval() is 400 ms on X11 which is just too long.
        // On Windows and Mac OS X, the operating system's value is used.
        // On Microsoft Windows, calling this function sets the double
@@ -1039,6 +1095,9 @@ GuiApplication::GuiApplication(int & argc, char ** argv)
        // This is clearly not enough in a time where we use threads for
        // document preview and/or export. 20 should be OK.
        QThreadPool::globalInstance()->setMaxThreadCount(20);
+
+       // make sure tooltips are formatted
+       installEventFilter(new ToolTipFormatter(this));
 }
 
 
@@ -1048,6 +1107,16 @@ GuiApplication * theGuiApp()
 }
 
 
+double GuiApplication::pixelRatio() const
+{
+#if QT_VERSION >= 0x050000
+       return qt_scale_factor * devicePixelRatio();
+#else
+       return 1.0;
+#endif
+}
+
+
 void GuiApplication::clearSession()
 {
        QSettings settings;
@@ -1061,6 +1130,12 @@ docstring Application::iconName(FuncRequest const & f, bool unknown)
 }
 
 
+docstring Application::mathIcon(docstring const & c)
+{
+       return qstring_to_ucs4(findImg(toqstr(c)));
+}
+
+
 FuncStatus GuiApplication::getStatus(FuncRequest const & cmd) const
 {
        FuncStatus status;
@@ -1314,26 +1389,27 @@ static docstring makeDispatchMessage(docstring const & msg,
 }
 
 
-void GuiApplication::dispatch(FuncRequest const & cmd)
+DispatchResult const & GuiApplication::dispatch(FuncRequest const & cmd)
 {
        Buffer * buffer = 0;
        if (current_view_ && current_view_->currentBufferView()) {
                current_view_->currentBufferView()->cursor().saveBeforeDispatchPosXY();
                buffer = &current_view_->currentBufferView()->buffer();
-               if (buffer)
-                       buffer->undo().beginUndoGroup();
        }
 
        DispatchResult dr;
+       dr.screenUpdate(Update::FitCursor);
+       {
+               // This handles undo groups automagically
+               UndoGroupHelper ugh(buffer);
+               dispatch(cmd, dr);
+       }
+
        // redraw the screen at the end (first of the two drawing steps).
        // This is done unless explicitly requested otherwise
-       dr.screenUpdate(Update::FitCursor);
-       dispatch(cmd, dr);
        updateCurrentView(cmd, dr);
-
-       // the buffer may have been closed by one action
-       if (theBufferList().isLoaded(buffer))
-               buffer->undo().endUndoGroup();
+       d->dispatch_result_ = dr;
+       return d->dispatch_result_;
 }
 
 
@@ -1347,6 +1423,9 @@ void GuiApplication::updateCurrentView(FuncRequest const & cmd, DispatchResult &
                if (dr.needBufferUpdate()) {
                        bv->cursor().clearBufferUpdate();
                        bv->buffer().updateBuffer();
+               } else if (dr.needChangesUpdate()) {
+                       // updateBuffer() already updates the change-tracking presence flag
+                       bv->buffer().updateChangesPresent();
                }
                // BufferView::update() updates the ViewMetricsInfo and
                // also initializes the position cache for all insets in
@@ -1358,7 +1437,7 @@ void GuiApplication::updateCurrentView(FuncRequest const & cmd, DispatchResult &
                theSelection().haveSelection(bv->cursor().selection());
 
                // update gui
-               current_view_->restartCursor();
+               current_view_->restartCaret();
        }
        if (dr.needMessageUpdate()) {
                // Some messages may already be translated, so we cannot use _()
@@ -1398,6 +1477,7 @@ void GuiApplication::gotoBookmark(unsigned int idx, bool openFile,
        // if the current buffer is not that one, switch to it.
        BufferView * doc_bv = current_view_ ?
                current_view_->documentBufferView() : 0;
+       Cursor const * old = doc_bv ? &doc_bv->cursor() : 0;
        if (!doc_bv || doc_bv->buffer().fileName() != tmp.filename) {
                if (switchToBuffer) {
                        dispatch(FuncRequest(LFUN_BUFFER_SWITCH, file));
@@ -1409,16 +1489,19 @@ void GuiApplication::gotoBookmark(unsigned int idx, bool openFile,
        }
 
        // moveToPosition try paragraph id first and then paragraph (pit, pos).
-       if (!doc_bv->moveToPosition(
+       if (!doc_bv || !doc_bv->moveToPosition(
                        tmp.bottom_pit, tmp.bottom_pos, tmp.top_id, tmp.top_pos))
                return;
 
+       Cursor & cur = doc_bv->cursor();
+       if (old && cur != *old)
+               notifyCursorLeavesOrEnters(*old, cur);
+
        // bm changed
        if (idx == 0)
                return;
 
        // Cursor jump succeeded!
-       Cursor const & cur = doc_bv->cursor();
        pit_type new_pit = cur.pit();
        pos_type new_pos = cur.pos();
        int new_id = cur.paragraph().id();
@@ -1441,18 +1524,16 @@ void GuiApplication::reconfigure(string const & option)
                current_view_->message(_("Running configure..."));
 
        // Run configure in user lyx directory
-       PathChanger p(package().user_support());
-       string configure_command = package().configure_command();
-       configure_command += option;
-       Systemcall one;
-       int const ret = one.startscript(Systemcall::Wait, configure_command);
-       p.pop();
+       string const lock_file = package().getConfigureLockName();
+       int fd = fileLock(lock_file.c_str());
+       int const ret = package().reconfigureUserLyXDir(option);
        // emit message signal.
        if (current_view_)
                current_view_->message(_("Reloading configuration..."));
        lyxrc.read(libFileSearch(QString(), "lyxrc.defaults"), false);
        // Re-read packages.lst
        LaTeXPackages::getAvailable();
+       fileUnlock(fd, lock_file.c_str());
 
        if (ret)
                Alert::information(_("System reconfiguration failed"),
@@ -1550,20 +1631,13 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
        case LFUN_SCREEN_FONT_UPDATE: {
                // handle the screen font changes.
                d->font_loader_.update();
-               // Backup current_view_
-               GuiView * view = current_view_;
-               // Set current_view_ to zero to forbid GuiWorkArea::redraw()
-               // to skip the refresh.
-               current_view_ = 0;
-               theBufferList().changed(false);
-               // Restore current_view_
-               current_view_ = view;
+               dr.screenUpdate(Update::Force | Update::FitCursor);
                break;
        }
 
        case LFUN_BUFFER_NEW:
                validateCurrentView();
-               if (d->views_.empty()
+               if (!current_view_
                   || (!lyxrc.open_buffers_in_tabs && current_view_->documentBufferView() != 0)) {
                        createView(QString(), false); // keep hidden
                        current_view_->newDocument(to_utf8(cmd.argument()), false);
@@ -1576,7 +1650,7 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
 
        case LFUN_BUFFER_NEW_TEMPLATE:
                validateCurrentView();
-               if (d->views_.empty()
+               if (!current_view_
                   || (!lyxrc.open_buffers_in_tabs && current_view_->documentBufferView() != 0)) {
                        createView();
                        current_view_->newDocument(to_utf8(cmd.argument()), true);
@@ -1588,16 +1662,14 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                break;
 
        case LFUN_FILE_OPEN: {
+               // FIXME: normally the code below is not needed, since getStatus makes sure that
+               //   current_view_ is not null.
                validateCurrentView();
                // FIXME: create a new method shared with LFUN_HELP_OPEN.
                string const fname = to_utf8(cmd.argument());
-               if (!FileName::isAbsolute(fname)) {
-                       dr.setError(true);
-                       dr.setMessage(_("Absolute filename expected."));
-                       break;
-               }               
-               bool const is_open = theBufferList().getBuffer(FileName(fname));
-               if (d->views_.empty()
+               bool const is_open = FileName::isAbsolute(fname)
+                       && theBufferList().getBuffer(FileName(fname));
+               if (!current_view_
                    || (!lyxrc.open_buffers_in_tabs
                        && current_view_->documentBufferView() != 0
                        && !is_open)) {
@@ -1607,10 +1679,21 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                        crc = for_each(fname.begin(), fname.end(), crc);
                        createView(crc.checksum());
                        current_view_->openDocument(fname);
-                       if (current_view_ && !current_view_->documentBufferView())
+                       if (!current_view_->documentBufferView())
                                current_view_->close();
-               } else
+                       else if (cmd.origin() == FuncRequest::LYXSERVER) {
+                               current_view_->raise();
+                               current_view_->activateWindow();
+                               current_view_->showNormal();
+                       }
+               } else {
                        current_view_->openDocument(fname);
+                       if (cmd.origin() == FuncRequest::LYXSERVER) {
+                               current_view_->raise();
+                               current_view_->activateWindow();
+                               current_view_->showNormal();
+                       }
+               }
                break;
        }
 
@@ -1635,13 +1718,8 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                current_view_->message(bformat(_("Opening help file %1$s..."),
                                               makeDisplayPath(fname.absFileName())));
                Buffer * buf = current_view_->loadDocument(fname, false);
-
-#ifndef DEVEL_VERSION
                if (buf)
-                       buf->setReadonly(true);
-#else
-               (void) buf;
-#endif
+                       buf->setReadonly(!current_view_->develMode());
                break;
        }
 
@@ -1675,6 +1753,8 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                }
                // Make sure we don't keep old colors in cache.
                d->color_cache_.clear();
+               // Update the current view
+               lyx::dispatch(FuncRequest(LFUN_SCREEN_FONT_UPDATE));
                break;
        }
 
@@ -1698,14 +1778,14 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
 
                // If the request comes from the minibuffer, then we can't reset
                // the GUI, since that would destory the minibuffer itself and
-               // cause a crash, since we are currently in one of the methods of 
-               // GuiCommandBuffer. See bug #8540. 
+               // cause a crash, since we are currently in one of the methods of
+               // GuiCommandBuffer. See bug #8540.
                if (cmd.origin() != FuncRequest::COMMANDBUFFER)
                        resetGui();
                // else
                //   FIXME Unfortunately, that leaves a bug here, since we cannot
                //   reset the GUI in this case. If the changes to lyxrc affected the
-               //   UI, then, nothing would happen. This seems fairly unlikely, but 
+               //   UI, then, nothing would happen. This seems fairly unlikely, but
                //   it definitely is a bug.
 
                break;
@@ -1765,12 +1845,19 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                // repeat command
                string countstr;
                string rest = split(argument, countstr, ' ');
-               istringstream is(countstr);
-               int count = 0;
-               is >> count;
-               //lyxerr << "repeat: count: " << count << " cmd: " << rest << endl;
-               for (int i = 0; i < count; ++i)
-                       dispatch(lyxaction.lookupFunc(rest));
+               int const count = convert<int>(countstr);
+               // an arbitrary number to limit number of iterations
+               int const max_iter = 10000;
+               if (count > max_iter) {
+                       dr.setMessage(bformat(_("Cannot iterate more than %1$d times"), max_iter));
+                       dr.setError(true);
+               } else {
+                       for (int i = 0; i < count; ++i) {
+                               FuncRequest lfun = lyxaction.lookupFunc(rest);
+                               lfun.allowAsync(false);
+                               dispatch(lfun);
+                       }
+               }
                break;
        }
 
@@ -1780,18 +1867,16 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                // FIXME: this LFUN should also work without any view.
                Buffer * buffer = (current_view_ && current_view_->documentBufferView())
                                  ? &(current_view_->documentBufferView()->buffer()) : 0;
-               if (buffer)
-                       buffer->undo().beginUndoGroup();
+               // This handles undo groups automagically
+               UndoGroupHelper ugh(buffer);
                while (!arg.empty()) {
                        string first;
                        arg = split(arg, first, ';');
                        FuncRequest func(lyxaction.lookupFunc(first));
+                       func.allowAsync(false);
                        func.setOrigin(cmd.origin());
                        dispatch(func);
                }
-               // the buffer may have been closed by one action
-               if (theBufferList().isLoaded(buffer))
-                       buffer->undo().endUndoGroup();
                break;
        }
 
@@ -1803,12 +1888,13 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
 
                QList<GuiView *> allViews = d->views_.values();
 
-               // this foreach does not modify any buffer. It just collects info on local visibility of buffers
-               // and on which buffer is active in each view.
+               // this for does not modify any buffer. It just collects info on local
+               // visibility of buffers and on which buffer is active in each view.
                Buffer * const last = theBufferList().last();
-               foreach (GuiView * view, allViews) {
-                       // all of the buffers might be locally hidden. That is, there is no active buffer.
-                       if (!view || !view->currentBufferView() || !&view->currentBufferView()->buffer())
+               for(GuiView * view : allViews) {
+                       // all of the buffers might be locally hidden. That is, there is no
+                       // active buffer.
+                       if (!view || !view->currentBufferView())
                                activeBuffers[view] = 0;
                        else
                                activeBuffers[view] = &view->currentBufferView()->buffer();
@@ -1854,7 +1940,7 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                }
 
                // put things back to how they were (if possible).
-               foreach (GuiView * view, allViews) {
+               for (GuiView * view : allViews) {
                        Buffer * originalBuf = activeBuffers[view];
                        // there might not have been an active buffer in this view or it might have been closed by the LFUN.
                        if (theBufferList().isLoaded(originalBuf))
@@ -1918,7 +2004,16 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                istringstream ss(argument);
                Lexer lex;
                lex.setStream(ss);
+
+               // See #9236
+               // We need to make sure that, after we recreat the DocumentClass,
+               // which we do in readHeader, we apply it to the document itself.
+               DocumentClassConstPtr olddc = defaults.params().documentClassPtr();
                int const unknown_tokens = defaults.readHeader(lex);
+               DocumentClassConstPtr newdc = defaults.params().documentClassPtr();
+               ErrorList el;
+               InsetText & theinset = static_cast<InsetText &>(defaults.inset());
+               cap::switchBetweenClasses(olddc, newdc, theinset, el);
 
                if (unknown_tokens != 0) {
                        lyxerr << "Warning in LFUN_BUFFER_SAVE_AS_DEFAULT!\n"
@@ -1968,7 +2063,7 @@ void GuiApplication::dispatch(FuncRequest const & cmd, DispatchResult & dr)
                                createView();
                }
        }
-
+       // fall through
        default:
                // The LFUN must be for one of GuiView, BufferView, Buffer or Cursor;
                // let's try that:
@@ -2017,21 +2112,45 @@ void GuiApplication::handleKeyFunc(FuncCode action)
 }
 
 
+//Keep this in sync with GuiApplication::processKeySym below
+bool GuiApplication::queryKeySym(KeySymbol const & keysym,
+                                 KeyModifier state) const
+{
+       // Do nothing if we have nothing
+       if (!keysym.isOK() || keysym.isModifier())
+               return false;
+       // Do a one-deep top-level lookup for cancel and meta-fake keys.
+       KeySequence seq;
+       FuncRequest func = seq.addkey(keysym, state);
+       // When not cancel or meta-fake, do the normal lookup.
+       if ((func.action() != LFUN_CANCEL) && (func.action() != LFUN_META_PREFIX)) {
+               seq = d->keyseq;
+               func = seq.addkey(keysym, (state | d->meta_fake_bit));
+       }
+       // Maybe user can only reach the key via holding down shift.
+       // Let's see. But only if shift is the only modifier
+       if (func.action() == LFUN_UNKNOWN_ACTION && state == ShiftModifier)
+               // If addkey looked up a command and did not find further commands then
+               // seq has been reset at this point
+               func = seq.addkey(keysym, NoModifier);
+
+       LYXERR(Debug::KEY, " Key (queried) [action=" << func.action() << "]["
+              << seq.print(KeySequence::Portable) << ']');
+       return func.action() != LFUN_UNKNOWN_ACTION;
+}
+
+
+//Keep this in sync with GuiApplication::queryKeySym above
 void GuiApplication::processKeySym(KeySymbol const & keysym, KeyModifier state)
 {
        LYXERR(Debug::KEY, "KeySym is " << keysym.getSymbolName());
 
        // Do nothing if we have nothing (JMarc)
-       if (!keysym.isOK()) {
-               LYXERR(Debug::KEY, "Empty kbd action (probably composing)");
+       if (!keysym.isOK() || keysym.isModifier()) {
+               if (!keysym.isOK())
+                       LYXERR(Debug::KEY, "Empty kbd action (probably composing)");
                if (current_view_)
-                       current_view_->restartCursor();
-               return;
-       }
-
-       if (keysym.isModifier()) {
-               if (current_view_)
-                       current_view_->restartCursor();
+                       current_view_->restartCaret();
                return;
        }
 
@@ -2075,23 +2194,60 @@ void GuiApplication::processKeySym(KeySymbol const & keysym, KeyModifier state)
        // Let's see. But only if shift is the only modifier
        if (func.action() == LFUN_UNKNOWN_ACTION && state == ShiftModifier) {
                LYXERR(Debug::KEY, "Trying without shift");
+               // If addkey looked up a command and did not find further commands then
+               // seq has been reset at this point
                func = d->keyseq.addkey(keysym, NoModifier);
                LYXERR(Debug::KEY, "Action now " << func.action());
        }
 
        if (func.action() == LFUN_UNKNOWN_ACTION) {
-               // Hmm, we didn't match any of the keysequences. See
-               // if it's normal insertable text not already covered
-               // by a binding
+               // We didn't match any of the key sequences.
+               // See if it's normal insertable text not already
+               // covered by a binding
                if (keysym.isText() && d->keyseq.length() == 1) {
+                       // Non-printable characters (such as ASCII control characters)
+                       // must not be inserted (#5704)
+                       if (!isPrintable(encoded_last_key)) {
+                               LYXERR(Debug::KEY, "Non-printable character! Omitting.");
+                               if (current_view_)
+                                       current_view_->restartCaret();
+                               return;
+                       }
+                       // The following modifier check is not needed on Mac.
+                       // The keysym is either not text or it is different
+                       // from the non-modifier keysym. See #9875 for the
+                       // broken alt-modifier effect of having this code active.
+#if !defined(Q_OS_MAC)
+                       // If a non-Shift Modifier is used we have a non-bound key sequence
+                       // (such as Alt+j = j). This should be omitted (#5575).
+                       // On Windows, AltModifier and ControlModifier are both
+                       // set when AltGr is pressed. Therefore, in order to not
+                       // break AltGr-bound symbols (see #5575 for details),
+                       // unbound Ctrl+Alt key sequences are allowed.
+                       if ((state & AltModifier || state & ControlModifier || state & MetaModifier)
+#if defined(Q_OS_WIN) || defined(Q_CYGWIN_WIN)
+                           && !(state & AltModifier && state & ControlModifier)
+#endif
+                           )
+                       {
+                               if (current_view_) {
+                                       current_view_->message(_("Unknown function."));
+                                       current_view_->restartCaret();
+                               }
+                               return;
+                       }
+#endif
+                       // Since all checks above were passed, we now really have text that
+                       // is to be inserted (e.g., AltGr-bound symbols). Thus change the
+                       // func to LFUN_SELF_INSERT and thus cause the text to be inserted
+                       // below.
                        LYXERR(Debug::KEY, "isText() is true, inserting.");
-                       func = FuncRequest(LFUN_SELF_INSERT,
-                                          FuncRequest::KEYBOARD);
+                       func = FuncRequest(LFUN_SELF_INSERT, FuncRequest::KEYBOARD);
                } else {
-                       LYXERR(Debug::KEY, "Unknown, !isText() - giving up");
+                       LYXERR(Debug::KEY, "Unknown Action and not isText() -- giving up");
                        if (current_view_) {
                                current_view_->message(_("Unknown function."));
-                               current_view_->restartCursor();
+                               current_view_->restartCaret();
                        }
                        return;
                }
@@ -2125,8 +2281,12 @@ void GuiApplication::processFuncRequestAsync(FuncRequest const & func)
 void GuiApplication::processFuncRequestQueue()
 {
        while (!d->func_request_queue_.empty()) {
-               processFuncRequest(d->func_request_queue_.front());
+               // take the item from the stack _before_ processing the
+               // request in order to avoid race conditions from nested
+               // or parallel requests (see #10406)
+               FuncRequest const fr(d->func_request_queue_.front());
                d->func_request_queue_.pop();
+               processFuncRequest(fr);
        }
 }
 
@@ -2189,6 +2349,8 @@ void GuiApplication::createView(QString const & geometry_arg, bool autoShow,
 
        LYXERR(Debug::GUI, "About to create new window with ID " << id);
        GuiView * view = new GuiView(id);
+       // `view' is the new current_view_. Tell coverity that is is not 0.
+       LATTEST(current_view_);
        // register view
        d->views_[id] = view;
 
@@ -2198,22 +2360,55 @@ void GuiApplication::createView(QString const & geometry_arg, bool autoShow,
        }
 
        if (!geometry_arg.isEmpty()) {
-#ifdef Q_WS_WIN
+#if defined(Q_OS_WIN) || defined(Q_CYGWIN_WIN)
                int x, y;
                int w, h;
-               QRegExp re( "[=]*(?:([0-9]+)[xX]([0-9]+)){0,1}[ ]*(?:([+-][0-9]*)([+-][0-9]*)){0,1}" );
+               QChar sx, sy;
+               QRegExp re( "[=]*(?:([0-9]+)[xX]([0-9]+)){0,1}[ ]*(?:([+-][0-9]*)){0,1}(?:([+-][0-9]*)){0,1}" );
                re.indexIn(geometry_arg);
                w = re.cap(1).toInt();
                h = re.cap(2).toInt();
                x = re.cap(3).toInt();
                y = re.cap(4).toInt();
+               sx = re.cap(3).isEmpty() ? '+' : re.cap(3).at(0);
+               sy = re.cap(4).isEmpty() ? '+' : re.cap(4).at(0);
+               // Set initial geometry such that we can get the frame size.
                view->setGeometry(x, y, w, h);
+               int framewidth = view->geometry().x() - view->x();
+               int titleheight = view->geometry().y() - view->y();
+               // Negative displacements must be interpreted as distances
+               // from the right or bottom screen borders.
+               if (sx == '-' || sy == '-') {
+                       QRect rec = QApplication::desktop()->screenGeometry();
+                       if (sx == '-')
+                               x += rec.width() - w - framewidth;
+                       if (sy == '-')
+                               y += rec.height() - h - titleheight;
+                       view->setGeometry(x, y, w, h);
+               }
+               // Make sure that the left and top frame borders are visible.
+               if (view->x() < 0 || view->y() < 0) {
+                       if (view->x() < 0)
+                               x = framewidth;
+                       if (view->y() < 0)
+                               y = titleheight;
+                       view->setGeometry(x, y, w, h);
+               }
 #endif
        }
        view->setFocus();
 }
 
 
+bool GuiApplication::unhide(Buffer * buf)
+{
+       if (!currentView())
+               return false;
+       currentView()->setBuffer(buf, false);
+       return true;
+}
+
+
 Clipboard & GuiApplication::clipboard()
 {
        return d->clipboard_;
@@ -2326,14 +2521,17 @@ void GuiApplication::execBatchCommands()
                // Gives some error box here.
                return;
 
-#ifdef Q_WS_MACX
+#ifdef Q_OS_MAC
 #if QT_VERSION > 0x040600
        setAttribute(Qt::AA_MacDontSwapCtrlAndMeta,lyxrc.mac_dontswap_ctrl_meta);
+#endif
+#if QT_VERSION > 0x050100
+       setAttribute(Qt::AA_UseHighDpiPixmaps,true);
 #endif
        // Create the global default menubar which is shown for the dialogs
        // and if no GuiView is visible.
        // This must be done after the session was recovered to know the "last files".
-       d->global_menubar_ = new GlobalMenuBar;
+       d->global_menubar_ = new QMenuBar(0);
        d->menus_.fillMenuBar(d->global_menubar_, 0, true);
 #endif
 
@@ -2348,13 +2546,12 @@ QAbstractItemModel * GuiApplication::languageModel()
 
        QStandardItemModel * lang_model = new QStandardItemModel(this);
        lang_model->insertColumns(0, 3);
-       int current_row;
-       QIcon speller(getPixmap("images/", "dialog-show_spellchecker", "png"));
-       QIcon saurus(getPixmap("images/", "thesaurus-entry", "png"));
+       QIcon speller(getPixmap("images/", "dialog-show_spellchecker", "svgz,png"));
+       QIcon saurus(getPixmap("images/", "thesaurus-entry", "svgz,png"));
        Languages::const_iterator it = lyx::languages.begin();
        Languages::const_iterator end = lyx::languages.end();
        for (; it != end; ++it) {
-               current_row = lang_model->rowCount();
+               int current_row = lang_model->rowCount();
                lang_model->insertRows(current_row, 1);
                QModelIndex pl_item = lang_model->index(current_row, 0);
                QModelIndex sp_item = lang_model->index(current_row, 1);
@@ -2394,7 +2591,7 @@ void GuiApplication::restoreGuiSession()
        // not be added at all (help files).
        for (size_t i = 0; i < lastopened.size(); ++i) {
                FileName const & file_name = lastopened[i].file_name;
-               if (d->views_.empty() || (!lyxrc.open_buffers_in_tabs
+               if (!current_view_ || (!lyxrc.open_buffers_in_tabs
                          && current_view_->documentBufferView() != 0)) {
                        boost::crc_32_type crc;
                        string const & fname = file_name.absFileName();
@@ -2420,7 +2617,6 @@ void GuiApplication::restoreGuiSession()
 QString const GuiApplication::romanFontName()
 {
        QFont font;
-       font.setKerning(false);
        font.setStyleHint(QFont::Serif);
        font.setFamily("serif");
 
@@ -2431,7 +2627,6 @@ QString const GuiApplication::romanFontName()
 QString const GuiApplication::sansFontName()
 {
        QFont font;
-       font.setKerning(false);
        font.setStyleHint(QFont::SansSerif);
        font.setFamily("sans");
 
@@ -2441,12 +2636,41 @@ QString const GuiApplication::sansFontName()
 
 QString const GuiApplication::typewriterFontName()
 {
-       QFont font;
-       font.setKerning(false);
-       font.setStyleHint(QFont::TypeWriter);
-       font.setFamily("monospace");
+       return QFontInfo(typewriterSystemFont()).family();
+}
 
-       return QFontInfo(font).family();
+
+namespace {
+       // We cannot use QFont::fixedPitch() because it doesn't
+       // return the fact but only if it is requested.
+       static bool isFixedPitch(const QFont & font) {
+               const QFontInfo fi(font);
+               return fi.fixedPitch();
+       }
+} // namespace
+
+
+QFont const GuiApplication::typewriterSystemFont()
+{
+#if QT_VERSION >= 0x050200
+       QFont font = QFontDatabase::systemFont(QFontDatabase::FixedFont);
+#else
+       QFont font("monospace");
+#endif
+       if (!isFixedPitch(font)) {
+               // try to enforce a real monospaced font
+               font.setStyleHint(QFont::Monospace);
+               if (!isFixedPitch(font)) {
+                       font.setStyleHint(QFont::TypeWriter);
+                       if (!isFixedPitch(font)) font.setFamily("courier");
+               }
+       }
+#ifdef Q_OS_MAC
+       // On a Mac the result is too small and it's not practical to
+       // rely on Qtconfig utility to change the system settings of Qt.
+       font.setPointSize(12);
+#endif
+       return font;
 }
 
 
@@ -2495,7 +2719,8 @@ bool GuiApplication::notify(QObject * receiver, QEvent * event)
 #endif
                        // In release mode, try to exit gracefully.
                        this->exit(1);
-
+                       // FIXME: GCC 7 thinks we can fall through here. Can we?
+                       // fall through
                case BufferException: {
                        if (!current_view_ || !current_view_->documentBufferView())
                                return false;
@@ -2591,13 +2816,18 @@ void GuiApplication::unregisterSocketCallback(int fd)
 
 void GuiApplication::commitData(QSessionManager & sm)
 {
-       /// The implementation is required to avoid an application exit
-       /// when session state save is triggered by session manager.
-       /// The default implementation sends a close event to all
-       /// visible top level widgets when session managment allows
-       /// interaction.
-       /// We are changing that to close all wiew one by one.
-       /// FIXME: verify if the default implementation is enough now.
+       /** The implementation is required to avoid an application exit
+        ** when session state save is triggered by session manager.
+        ** The default implementation sends a close event to all
+        ** visible top level widgets when session managment allows
+        ** interaction.
+        ** We are changing that to check the state of each buffer in all
+        ** views and ask the users what to do if buffers are dirty.
+        ** Furthermore, we save the session state.
+        ** We do NOT close the views here since the user still can cancel
+        ** the logout process (see #9277); also, this would hide LyX from
+        ** an OSes own session handling (application restoration).
+        **/
        #ifdef QT_NO_SESSIONMANAGER
                #ifndef _MSC_VER
                        #warning Qt is compiled without session manager
@@ -2606,18 +2836,21 @@ void GuiApplication::commitData(QSessionManager & sm)
                #endif
                (void) sm;
        #else
-               if (sm.allowsInteraction() && !closeAllViews())
+               if (sm.allowsInteraction() && !prepareAllViewsForLogout())
                        sm.cancel();
+               else
+                       sm.release();
        #endif
 }
 
 
 void GuiApplication::unregisterView(GuiView * gv)
 {
-       LAPPERR(d->views_[gv->id()] == gv);
-       d->views_.remove(gv->id());
-       if (current_view_ == gv)
-               current_view_ = 0;
+       if(d->views_.contains(gv->id()) && d->views_.value(gv->id()) == gv) {
+               d->views_.remove(gv->id());
+               if (current_view_ == gv)
+                       current_view_ = 0;
+       }
 }
 
 
@@ -2631,7 +2864,7 @@ bool GuiApplication::closeAllViews()
        theSession().lastOpened().clear();
 
        QList<GuiView *> const views = d->views_.values();
-       foreach (GuiView * view, views) {
+       for (GuiView * view : views) {
                if (!view->closeScheduled())
                        return false;
        }
@@ -2641,6 +2874,21 @@ bool GuiApplication::closeAllViews()
 }
 
 
+bool GuiApplication::prepareAllViewsForLogout()
+{
+       if (d->views_.empty())
+               return true;
+
+       QList<GuiView *> const views = d->views_.values();
+       for (GuiView * view : views) {
+               if (!view->prepareAllBuffersForLogout())
+                       return false;
+       }
+
+       return true;
+}
+
+
 GuiView & GuiApplication::view(int id) const
 {
        LAPPERR(d->views_.contains(id));
@@ -2651,7 +2899,7 @@ GuiView & GuiApplication::view(int id) const
 void GuiApplication::hideDialogs(string const & name, Inset * inset) const
 {
        QList<GuiView *> const views = d->views_.values();
-       foreach (GuiView * view, views)
+       for (GuiView * view : views)
                view->hideDialog(name, inset);
 }
 
@@ -2739,7 +2987,7 @@ GuiApplication::ReturnValues GuiApplication::readUIFile(FileName ui_path)
                        QString const file = toqstr(lex.getString());
                        bool const success = readUIFile(file, true);
                        if (!success) {
-                               LYXERR0("Failed to read inlcuded file: " << fromqstr(file));
+                               LYXERR0("Failed to read included file: " << fromqstr(file));
                                return ReadError;
                        }
                        break;
@@ -2831,14 +3079,14 @@ bool GuiApplication::readUIFile(QString const & name, bool include)
 
        if (retval == FormatMismatch) {
                LYXERR(Debug::FILES, "Converting ui file to format " << LFUN_FORMAT);
-               FileName const tempfile = FileName::tempName("convert_ui");
+               TempFile tmp("convertXXXXXX.ui");
+               FileName const tempfile = tmp.name();
                bool const success = prefs2prefs(ui_path, tempfile, true);
                if (!success) {
                        LYXERR0("Unable to convert " << ui_path.absFileName() <<
                                " to format " << LFUN_FORMAT << ".");
                } else {
                        retval = readUIFile(tempfile);
-                       tempfile.removeFile();
                }
        }
 
@@ -2921,8 +3169,26 @@ bool GuiApplication::x11EventFilter(XEvent * xev)
                BufferView * bv = current_view_->currentBufferView();
                if (bv) {
                        docstring const sel = bv->requestSelection();
-                       if (!sel.empty())
+                       if (!sel.empty()) {
                                d->selection_.put(sel);
+                               // Refresh the selection request timestamp.
+                               // We have to do this by ourselves as Qt seems
+                               // not doing that, maybe because of our
+                               // "persistent selection" implementation
+                               // (see comments in GuiSelection.cpp).
+                               XSelectionEvent nev;
+                               nev.type = SelectionNotify;
+                               nev.display = xev->xselectionrequest.display;
+                               nev.requestor = xev->xselectionrequest.requestor;
+                               nev.selection = xev->xselectionrequest.selection;
+                               nev.target = xev->xselectionrequest.target;
+                               nev.property = 0L; // None
+                               nev.time = CurrentTime;
+                               XSendEvent(QX11Info::display(),
+                                       nev.requestor, False, 0,
+                                       reinterpret_cast<XEvent *>(&nev));
+                               return true;
+                       }
                }
                break;
        }
@@ -2938,6 +3204,65 @@ bool GuiApplication::x11EventFilter(XEvent * xev)
        }
        return false;
 }
+#elif defined(QPA_XCB)
+bool GuiApplication::nativeEventFilter(const QByteArray & eventType,
+                                      void * message, long *)
+{
+       if (!current_view_ || eventType != "xcb_generic_event_t")
+               return false;
+
+       xcb_generic_event_t * ev = static_cast<xcb_generic_event_t *>(message);
+
+       switch (ev->response_type) {
+       case XCB_SELECTION_REQUEST: {
+               xcb_selection_request_event_t * srev =
+                       reinterpret_cast<xcb_selection_request_event_t *>(ev);
+               if (srev->selection != XCB_ATOM_PRIMARY)
+                       break;
+               LYXERR(Debug::SELECTION, "X requested selection.");
+               BufferView * bv = current_view_->currentBufferView();
+               if (bv) {
+                       docstring const sel = bv->requestSelection();
+                       if (!sel.empty()) {
+                               d->selection_.put(sel);
+#ifdef HAVE_QT5_X11_EXTRAS
+                               // Refresh the selection request timestamp.
+                               // We have to do this by ourselves as Qt seems
+                               // not doing that, maybe because of our
+                               // "persistent selection" implementation
+                               // (see comments in GuiSelection.cpp).
+                               xcb_selection_notify_event_t nev;
+                               nev.response_type = XCB_SELECTION_NOTIFY;
+                               nev.requestor = srev->requestor;
+                               nev.selection = srev->selection;
+                               nev.target = srev->target;
+                               nev.property = XCB_NONE;
+                               nev.time = XCB_CURRENT_TIME;
+                               xcb_connection_t * con = QX11Info::connection();
+                               xcb_send_event(con, 0, srev->requestor,
+                                       XCB_EVENT_MASK_NO_EVENT,
+                                       reinterpret_cast<char const *>(&nev));
+                               xcb_flush(con);
+#endif
+                               return true;
+                       }
+               }
+               break;
+       }
+       case XCB_SELECTION_CLEAR: {
+               xcb_selection_clear_event_t * scev =
+                       reinterpret_cast<xcb_selection_clear_event_t *>(ev);
+               if (scev->selection != XCB_ATOM_PRIMARY)
+                       break;
+               LYXERR(Debug::SELECTION, "Lost selection.");
+               BufferView * bv = current_view_->currentBufferView();
+               if (bv)
+                       bv->clearSelection();
+               break;
+       }
+       }
+       return false;
+}
 #endif
 
 } // namespace frontend