]> git.lyx.org Git - lyx.git/blobdiff - src/Paragraph.cpp
nullptr
[lyx.git] / src / Paragraph.cpp
index e4b774d3f022de5307fd6f0ba301e2a5ed987374..1b6a766fb54f6a7d289bc7eeb443260ff0f25c7f 100644 (file)
@@ -5,7 +5,7 @@
  *
  * \author Asger Alstrup
  * \author Lars Gullik Bjønnes
- * \author Richard Heck (XHTML output)
+ * \author Richard Kimberly Heck (XHTML output)
  * \author Jean-Marc Lasgouttes
  * \author Angus Leeming
  * \author John Levon
 
 #include "Paragraph.h"
 
-#include "LayoutFile.h"
 #include "Buffer.h"
 #include "BufferParams.h"
+#include "BufferEncodings.h"
 #include "Changes.h"
 #include "Counters.h"
-#include "BufferEncodings.h"
 #include "InsetList.h"
 #include "Language.h"
 #include "LaTeXFeatures.h"
 #include "output_docbook.h"
 #include "ParagraphParameters.h"
 #include "SpellChecker.h"
-#include "xml.h"
 #include "texstream.h"
-#include "TextClass.h"
 #include "TexRow.h"
 #include "Text.h"
+#include "TextClass.h"
 #include "WordLangTuple.h"
 #include "WordList.h"
 
 
 #include "support/debug.h"
 #include "support/docstring_list.h"
-#include "support/ExceptionMessage.h"
 #include "support/gettext.h"
 #include "support/lassert.h"
-#include "support/Length.h"
 #include "support/lstrings.h"
 #include "support/textutils.h"
-#include "output_docbook.h"
 
 #include <atomic>
 #include <sstream>
@@ -342,7 +337,10 @@ public:
                                   Change & running_change,
                                   Layout const & style,
                                   pos_type & i,
-                                  unsigned int & column);
+                                  unsigned int & column,
+                                  bool const fontswitch_inset,
+                                  bool const closeLanguage,
+                                  bool const lang_switched_at_inset);
 
        ///
        void latexSpecialChar(
@@ -361,19 +359,19 @@ public:
                char_type const c,
                otexstream & os,
                pos_type i,
-               unsigned int & column);
+               unsigned int & column) const;
        ///
        bool latexSpecialTU(
                char_type const c,
                otexstream & os,
                pos_type i,
-               unsigned int & column);
+               unsigned int & column) const;
        ///
        bool latexSpecialT3(
                char_type const c,
                otexstream & os,
                pos_type i,
-               unsigned int & column);
+               unsigned int & column) const;
 
        ///
        void validate(LaTeXFeatures & features) const;
@@ -867,6 +865,7 @@ int Paragraph::eraseChars(pos_type start, pos_type end, bool trackChanges)
        return end - i;
 }
 
+
 // Handle combining characters
 int Paragraph::Private::latexSurrogatePair(BufferParams const & bparams,
                otexstream & os, char_type c, char_type next,
@@ -957,7 +956,10 @@ void Paragraph::Private::latexInset(BufferParams const & bparams,
                                    Change & running_change,
                                    Layout const & style,
                                    pos_type & i,
-                                   unsigned int & column)
+                                   unsigned int & column,
+                                   bool const fontswitch_inset,
+                                   bool const closeLanguage,
+                                   bool const lang_switched_at_inset)
 {
        Inset * inset = owner_->getInset(i);
        LBUFERR(inset);
@@ -1027,42 +1029,64 @@ void Paragraph::Private::latexInset(BufferParams const & bparams,
                close = true;
        }
 
-       // FIXME: Bug: we can have an empty font change here!
-       // if there has just been a font change, we are going to close it
-       // right now, which means stupid latex code like \textsf{}. AFAIK,
-       // this does not harm dvi output. A minor bug, thus (JMarc)
-
-       // Some insets cannot be inside a font change command.
-       // However, even such insets *can* be placed in \L or \R
-       // or their equivalents (for RTL language switches), so we don't
-       // close the language in those cases.
-       // ArabTeX, though, cannot handle this special behavior, it seems.
-       bool arabtex = basefont.language()->lang() == "arabic_arabtex"
-               || running_font.language()->lang() == "arabic_arabtex";
-       if (open_font && !inset->inheritFont()) {
-               bool closeLanguage = arabtex
-                       || basefont.isRightToLeft() == running_font.isRightToLeft();
-               unsigned int count = running_font.latexWriteStartChanges(os, bparams,
-                                                     runparams, basefont,
-                                                     basefont, true);
-               column += count;
-               // if any font properties were closed, update the running_font,
-               // making sure, however, to leave the language as it was
-               if (count > 0) {
-                       // FIXME: probably a better way to keep track of the old
-                       // language, than copying the entire font?
-                       Font const copy_font(running_font);
-                       basefont = owner_->getLayoutFont(bparams, outerfont);
-                       running_font = basefont;
-                       if (!closeLanguage)
-                               running_font.setLanguage(copy_font.language());
-                       // For these, we use switches, so no need to close
-                       basefont.fontInfo().setSize(copy_font.fontInfo().size());
-                       basefont.fontInfo().setFamily(copy_font.fontInfo().family());
-                       basefont.fontInfo().setSeries(copy_font.fontInfo().series());
-                       if (closeLanguage)
-                               runparams.local_font = &basefont;
+       if (open_font && fontswitch_inset) {
+               bool lang_closed = false;
+               // Close language if needed
+               if (closeLanguage && !lang_switched_at_inset) {
+                       // We need prev_font here as language changes directly at inset
+                       // will only be started inside the inset.
+                       Font const prev_font = (i > 0) ?
+                                               owner_->getFont(bparams, i - 1, outerfont)
+                                             : running_font;
+                       Font tmpfont(basefont);
+                       tmpfont.setLanguage(prev_font.language());
+                       bool needPar = false;
+                       unsigned int count = tmpfont.latexWriteEndChanges(os, bparams, runparams,
+                                                                         basefont, basefont,
+                                                                         needPar, closeLanguage);
+                       column += count;
+                       lang_closed = count > 0;
                }
+               // Update the running_font, making sure, however,
+               // to leave the language as it was.
+               // FIXME: probably a better way to keep track of the old
+               // language, than copying the entire font?
+               Font const copy_font(running_font);
+               basefont = owner_->getLayoutFont(bparams, outerfont);
+               running_font = basefont;
+               if (!closeLanguage)
+                       running_font.setLanguage(copy_font.language());
+               OutputParams rp = runparams;
+               rp.encoding = basefont.language()->encoding();
+               // For these, we use switches, so they should be taken as
+               // base inside the inset.
+               basefont.fontInfo().setSize(copy_font.fontInfo().size());
+               basefont.fontInfo().setFamily(copy_font.fontInfo().family());
+               basefont.fontInfo().setSeries(copy_font.fontInfo().series());
+               // Now re-do font changes in a way needed here
+               // (using switches with multi-par insets)
+               InsetText const * textinset = inset->asInsetText();
+               bool const cprotect = textinset
+                       ? textinset->hasCProtectContent(runparams.moving_arg)
+                         && !textinset->text().isMainText()
+                       : false;
+               unsigned int count2 = basefont.latexWriteStartChanges(os, bparams,
+                                                     rp, running_font,
+                                                     basefont, true,
+                                                     cprotect);
+               open_font = true;
+               column += count2;
+               if (count2 == 0 && (lang_closed || lang_switched_at_inset))
+                       // All fonts closed
+                       open_font = false;
+               if (closeLanguage)
+                       runparams.local_font = &basefont;
+       }
+
+       if (fontswitch_inset && !closeLanguage) {
+               // The directionality has been switched at inset.
+               // Force markup inside.
+               runparams.local_font = &basefont;
        }
 
        size_t const previous_row_count = os.texrow().rows();
@@ -1075,7 +1099,7 @@ void Paragraph::Private::latexInset(BufferParams const & bparams,
                // add location information and throw again.
                e.par_id = id_;
                e.pos = i;
-               throw(e);
+               throw;
        }
 
        if (close)
@@ -1105,10 +1129,12 @@ void Paragraph::Private::latexSpecialChar(otexstream & os,
 {
        char_type const c = owner_->getUChar(bparams, runparams, i);
 
-       if (style.pass_thru || runparams.pass_thru
+       if (style.pass_thru || runparams.pass_thru || runparams.for_search
            || contains(style.pass_thru_chars, c)
            || contains(runparams.pass_thru_chars, c)) {
-               if (c != '\0') {
+               if ((c == '\\') && runparams.for_search)
+                       os << "\\\\";
+               else if (c != '\0') {
                        Encoding const * const enc = runparams.encoding;
                        if (enc && !enc->encodable(c))
                                throw EncodingException(c);
@@ -1212,7 +1238,7 @@ void Paragraph::Private::latexSpecialChar(otexstream & os,
                    && !runparams.inIPA
                        // TODO #10961: && not in inset Flex Code
                        // TODO #10961: && not in layout LyXCode
-                   && (!bparams.useNonTeXFonts || runparams.flavor != OutputParams::XETEX)) {
+                   && (!bparams.useNonTeXFonts || runparams.flavor != Flavor::XeTeX)) {
                        if (c == 0x2013) {
                                // en-dash
                                os << "--";
@@ -1293,7 +1319,7 @@ void Paragraph::Private::latexSpecialChar(otexstream & os,
 
 
 bool Paragraph::Private::latexSpecialT1(char_type const c, otexstream & os,
-       pos_type i, unsigned int & column)
+       pos_type i, unsigned int & column) const
 {
        switch (c) {
        case '>':
@@ -1321,7 +1347,7 @@ bool Paragraph::Private::latexSpecialT1(char_type const c, otexstream & os,
 
 
 bool Paragraph::Private::latexSpecialTU(char_type const c, otexstream & os,
-       pos_type i, unsigned int & column)
+       pos_type i, unsigned int & column) const
 {
        // TU encoding is currently on par with T1.
        return latexSpecialT1(c, os, i, column);
@@ -1329,7 +1355,7 @@ bool Paragraph::Private::latexSpecialTU(char_type const c, otexstream & os,
 
 
 bool Paragraph::Private::latexSpecialT3(char_type const c, otexstream & os,
-       pos_type /*i*/, unsigned int & column)
+       pos_type /*i*/, unsigned int & column) const
 {
        switch (c) {
        case '*':
@@ -1366,7 +1392,7 @@ void Paragraph::Private::validate(LaTeXFeatures & features) const
                        features.addPreambleSnippet(os.release(), true);
        }
 
-       if (features.runparams().flavor == OutputParams::HTML
+       if (features.runparams().flavor == Flavor::Html
            && layout_->htmltitle()) {
                features.setHTMLTitle(owner_->asString(AS_STR_INSETS | AS_STR_SKIPDELETE));
        }
@@ -1461,7 +1487,7 @@ void Paragraph::Private::validate(LaTeXFeatures & features) const
                } else if (!bp.use_dash_ligatures
                           && (c == 0x2013 || c == 0x2014)
                           && bp.useNonTeXFonts
-                          && features.runparams().flavor == OutputParams::XETEX)
+                          && features.runparams().flavor == Flavor::XeTeX)
                        // XeTeX's dash behaviour is determined via a global setting
                        features.require("xetexdashbreakstate");
                BufferEncodings::validate(c, features);
@@ -1537,19 +1563,19 @@ void flushString(ostream & os, docstring & s)
 
 
 void Paragraph::write(ostream & os, BufferParams const & bparams,
-       depth_type & dth) const
+       depth_type & depth) const
 {
        // The beginning or end of a deeper (i.e. nested) area?
-       if (dth != d->params_.depth()) {
-               if (d->params_.depth() > dth) {
-                       while (d->params_.depth() > dth) {
+       if (depth != d->params_.depth()) {
+               if (d->params_.depth() > depth) {
+                       while (d->params_.depth() > depth) {
                                os << "\n\\begin_deeper";
-                               ++dth;
+                               ++depth;
                        }
                } else {
-                       while (d->params_.depth() < dth) {
+                       while (d->params_.depth() < depth) {
                                os << "\n\\end_deeper";
-                               --dth;
+                               --depth;
                        }
                }
        }
@@ -1662,11 +1688,11 @@ void Paragraph::validate(LaTeXFeatures & features) const
 }
 
 
-void Paragraph::insert(pos_type start, docstring const & str,
+void Paragraph::insert(pos_type pos, docstring const & str,
                       Font const & font, Change const & change)
 {
        for (size_t i = 0, n = str.size(); i != n ; ++i)
-               insertChar(start + i, str[i], font, change);
+               insertChar(pos + i, str[i], font, change);
 }
 
 
@@ -2486,7 +2512,7 @@ void Paragraph::latex(BufferParams const & bparams,
                if (c == META_INSET
                    && i >= start_pos && (end_pos == -1 || i < end_pos)) {
                        if (isDeleted(i))
-                               runparams.ctObject = getInset(i)->CtObject(runparams);
+                               runparams.ctObject = getInset(i)->getCtObject(runparams);
        
                        InsetMath const * im = getInset(i)->asInsetMath();
                        if (im && im->asHullInset()
@@ -2551,7 +2577,7 @@ void Paragraph::latex(BufferParams const & bparams,
                ++column;
 
                // Fully instantiated font
-               Font const current_font = getFont(bparams, i, outerfont);
+               Font current_font = getFont(bparams, i, outerfont);
                // Previous font
                Font const prev_font = (i > 0) ?
                                        getFont(bparams, i - 1, outerfont)
@@ -2562,16 +2588,38 @@ void Paragraph::latex(BufferParams const & bparams,
                                             && runningChange == change
                                             && change.type == Change::DELETED
                                             && !os.afterParbreak());
-               bool const non_inherit_inset =
-                               (c == META_INSET && getInset(i) && !getInset(i)->inheritFont());
+               // Insets where font switches are used (rather than font commands)
+               bool const fontswitch_inset =
+                               c == META_INSET
+                               && getInset(i)
+                               && getInset(i)->allowMultiPar()
+                               && getInset(i)->lyxCode() != ERT_CODE
+                               && getInset(i)->producesOutput();
+
+               bool closeLanguage = false;
+               bool lang_switched_at_inset = false;
+               if (fontswitch_inset) {
+                       // Some insets cannot be inside a font change command.
+                       // However, even such insets *can* be placed in \L or \R
+                       // or their equivalents (for RTL language switches),
+                       // so we don't close the language in those cases
+                       // (= differing isRightToLeft()).
+                       // ArabTeX, though, doesn't seem to handle this special behavior.
+                       closeLanguage = basefont.isRightToLeft() == current_font.isRightToLeft()
+                                       || basefont.language()->lang() == "arabic_arabtex"
+                                       || current_font.language()->lang() == "arabic_arabtex";
+                       // We need to check prev_font as language changes directly at inset
+                       // will only be started inside the inset.
+                       lang_switched_at_inset = prev_font.language() != current_font.language();
+               }
 
                // Do we need to close the previous font?
+               bool langClosed = false;
                if (open_font &&
                    ((current_font != running_font
                      || current_font.language() != running_font.language())
-                    || (non_inherit_inset
-                        && (current_font == prev_font
-                            || current_font.language() == prev_font.language()))))
+                    || (fontswitch_inset
+                        && (current_font == prev_font))))
                {
                        // ensure there is no open script-wrapper
                        if (!alien_script.empty()) {
@@ -2579,17 +2627,20 @@ void Paragraph::latex(BufferParams const & bparams,
                                os << "}";
                                alien_script.clear();
                        }
-                       bool needPar = false;
                        if (in_ct_deletion) {
                                // We have to close and then reopen \lyxdeleted,
                                // as strikeout needs to be on lowest level.
                                os << '}';
                                column += 1;
                        }
+                       if (closeLanguage)
+                               // Force language closing
+                               current_font.setLanguage(basefont.language());
+                       Font const nextfont = (i == body_pos-1) ? basefont : current_font;
+                       bool needPar = false;
                        column += running_font.latexWriteEndChanges(
                                    os, bparams, runparams, basefont,
-                                   (i == body_pos-1) ? basefont : current_font,
-                                   needPar);
+                                   nextfont, needPar);
                        if (in_ct_deletion) {
                                // We have to close and then reopen \lyxdeleted,
                                // as strikeout needs to be on lowest level.
@@ -2597,8 +2648,12 @@ void Paragraph::latex(BufferParams const & bparams,
                                column += Changes::latexMarkChange(os, bparams,
                                        Change(Change::UNCHANGED), Change(Change::DELETED), rp);
                        }
-                       running_font = basefont;
                        open_font = false;
+                       // Has the language been closed in the latexWriteEndChanges() call above?
+                       langClosed = running_font.language() != basefont.language()
+                                       && running_font.language() != nextfont.language()
+                                       && (running_font.language()->encoding()->package() != Encoding::CJK);
+                       running_font = basefont;
                }
 
                // if necessary, close language environment before opening CJK
@@ -2615,7 +2670,8 @@ void Paragraph::latex(BufferParams const & bparams,
                }
 
                // Switch file encoding if necessary (and allowed)
-               if (!runparams.pass_thru && !style.pass_thru &&
+               if ((!fontswitch_inset || closeLanguage)
+                   && !runparams.pass_thru && !style.pass_thru &&
                    runparams.encoding->package() != Encoding::none &&
                    current_font.language()->encoding()->package() != Encoding::none) {
                        pair<bool, int> const enc_switch =
@@ -2645,50 +2701,59 @@ void Paragraph::latex(BufferParams const & bparams,
                     current_font.language() != running_font.language())
                    && i != body_pos - 1)
                {
-                       if (in_ct_deletion) {
-                               // We have to close and then reopen \lyxdeleted,
-                               // as strikeout needs to be on lowest level.
-                               bool needPar = false;
-                               OutputParams rp = runparams;
-                               column += running_font.latexWriteEndChanges(
-                                       os, bparams, rp, basefont,
-                                       basefont, needPar);
-                               os << '}';
-                               column += 1;
-                       }
-                       otexstringstream ots;
-                       if (!non_inherit_inset) {
+                       if (!fontswitch_inset) {
+                               if (in_ct_deletion) {
+                                       // We have to close and then reopen \lyxdeleted,
+                                       // as strikeout needs to be on lowest level.
+                                       OutputParams rp = runparams;
+                                       bool needPar = false;
+                                       column += running_font.latexWriteEndChanges(
+                                               os, bparams, rp, basefont,
+                                               basefont, needPar);
+                                       os << '}';
+                                       column += 1;
+                               }
+                               otexstringstream ots;
+                               InsetText const * textinset = inInset().asInsetText();
+                               bool const cprotect = textinset
+                                       ? textinset->hasCProtectContent(runparams.moving_arg)
+                                         && !textinset->text().isMainText()
+                                       : false;
                                column += current_font.latexWriteStartChanges(ots, bparams,
-                                                                             runparams, basefont, last_font);
-                       }
-                       // Check again for display math in ulem commands as a
-                       // font change may also occur just before a math inset.
-                       if (runparams.inDisplayMath && !deleted_display_math
-                           && runparams.inulemcmd) {
-                               if (os.afterParbreak())
-                                       os << "\\noindent";
-                               else
-                                       os << "\\\\\n";
-                       }
-                       running_font = current_font;
-                       open_font = true;
-                       docstring fontchange = ots.str();
-                       os << fontchange;
-                       // check whether the fontchange ends with a \\textcolor
-                       // modifier and the text starts with a space. If so we
-                       // need to add } in order to prevent \\textcolor from gobbling
-                       // the space (bug 4473).
-                       docstring const last_modifier = rsplit(fontchange, '\\');
-                       if (prefixIs(last_modifier, from_ascii("textcolor")) && c == ' ')
-                               os << from_ascii("{}");
-                       else if (ots.terminateCommand())
-                               os << termcmd;
-                       if (in_ct_deletion) {
-                               // We have to close and then reopen \lyxdeleted,
-                               // as strikeout needs to be on lowest level.
-                               OutputParams rp = runparams;
-                               column += Changes::latexMarkChange(os, bparams,
-                                       Change(Change::UNCHANGED), change, rp);
+                                                                             runparams, basefont, last_font, false,
+                                                                             cprotect);
+                               // Check again for display math in ulem commands as a
+                               // font change may also occur just before a math inset.
+                               if (runparams.inDisplayMath && !deleted_display_math
+                                   && runparams.inulemcmd) {
+                                       if (os.afterParbreak())
+                                               os << "\\noindent";
+                                       else
+                                               os << "\\\\\n";
+                               }
+                               running_font = current_font;
+                               open_font = true;
+                               docstring fontchange = ots.str();
+                               os << fontchange;
+                               // check whether the fontchange ends with a \\textcolor
+                               // modifier and the text starts with a space. If so we
+                               // need to add } in order to prevent \\textcolor from gobbling
+                               // the space (bug 4473).
+                               docstring const last_modifier = rsplit(fontchange, '\\');
+                               if (prefixIs(last_modifier, from_ascii("textcolor")) && c == ' ')
+                                       os << from_ascii("{}");
+                               else if (ots.terminateCommand())
+                                       os << termcmd;
+                               if (in_ct_deletion) {
+                                       // We have to close and then reopen \lyxdeleted,
+                                       // as strikeout needs to be on lowest level.
+                                       OutputParams rp = runparams;
+                                       column += Changes::latexMarkChange(os, bparams,
+                                               Change(Change::UNCHANGED), change, rp);
+                               }
+                       } else {
+                               running_font = current_font;
+                               open_font = !langClosed;
                        }
                }
 
@@ -2751,28 +2816,36 @@ void Paragraph::latex(BufferParams const & bparams,
                                                incremented = true;
                                        }
                                }
-                               // We need to restore these after insets with
-                               // inheritFont() false
-                               Font const save_running_font = running_font;
+                               // We need to restore parts of this after insets with
+                               // allowMultiPar() true
                                Font const save_basefont = basefont;
                                d->latexInset(bparams, os, rp, running_font,
                                                basefont, real_outerfont, open_font,
-                                               runningChange, style, i, column);
-                               if (non_inherit_inset) {
-                                       running_font = save_running_font;
-                                       basefont = save_basefont;
+                                               runningChange, style, i, column, fontswitch_inset,
+                                               closeLanguage, lang_switched_at_inset);
+                               if (fontswitch_inset) {
+                                       if (open_font) {
+                                               bool needPar = false;
+                                               column += running_font.latexWriteEndChanges(
+                                                       os, bparams, runparams,
+                                                       basefont, basefont, needPar);
+                                               open_font = false;
+                                       }
+                                       basefont.fontInfo().setSize(save_basefont.fontInfo().size());
+                                       basefont.fontInfo().setFamily(save_basefont.fontInfo().family());
+                                       basefont.fontInfo().setSeries(save_basefont.fontInfo().series());
                                }
                                if (incremented)
                                        --parInline;
 
-                               if (runparams.ctObject == OutputParams::CT_DISPLAYOBJECT
-                                   || runparams.ctObject == OutputParams::CT_UDISPLAYOBJECT) {
+                               if (runparams.ctObject == CtObject::DisplayObject
+                                   || runparams.ctObject == CtObject::UDisplayObject) {
                                        // Close \lyx*deleted and force its
                                        // reopening (if needed)
                                        os << '}';
                                        column++;
                                        runningChange = Change(Change::UNCHANGED);
-                                       runparams.ctObject = OutputParams::CT_NORMAL;
+                                       runparams.ctObject = CtObject::Normal;
                                }
                        }
                } else if (i >= start_pos && (end_pos == -1 || i < end_pos)) {
@@ -2804,7 +2877,7 @@ void Paragraph::latex(BufferParams const & bparams,
                                        // add location information and throw again.
                                        e.par_id = id();
                                        e.pos = i;
-                                       throw(e);
+                                       throw;
                                }
                        }
                }
@@ -2832,6 +2905,31 @@ void Paragraph::latex(BufferParams const & bparams,
                alien_script.clear();
        }
 
+       Font const font = empty()
+               ? getLayoutFont(bparams, real_outerfont)
+               : getFont(bparams, size() - 1, real_outerfont);
+
+       InsetText const * textinset = inInset().asInsetText();
+
+       bool const maintext = textinset
+               ? textinset->text().isMainText()
+               : false;
+
+       size_t const numpars = textinset
+               ? textinset->text().paragraphs().size()
+               : 0;
+
+       bool needPar = false;
+
+       if (style.resfont.size() != font.fontInfo().size()
+           && (!runparams.isLastPar || maintext
+               || (numpars > 1 && d->ownerCode() != CELL_CODE
+                   && (inInset().getLayout().isDisplay()
+                       || parInline)))
+           && !style.isCommand()) {
+               needPar = true;
+       }
+
        // If we have an open font definition, we have to close it
        if (open_font) {
                // Make sure that \\par is done with the font of the last
@@ -2843,31 +2941,6 @@ void Paragraph::latex(BufferParams const & bparams,
                // We must not change the font for the last paragraph
                // of non-multipar insets, tabular cells or commands,
                // since this produces unwanted whitespace.
-
-               Font const font = empty()
-                       ? getLayoutFont(bparams, real_outerfont)
-                       : getFont(bparams, size() - 1, real_outerfont);
-
-               InsetText const * textinset = inInset().asInsetText();
-
-               bool const maintext = textinset
-                       ? textinset->text().isMainText()
-                       : false;
-
-               size_t const numpars = textinset
-                       ? textinset->text().paragraphs().size()
-                       : 0;
-
-               bool needPar = false;
-
-               if (style.resfont.size() != font.fontInfo().size()
-                   && (!runparams.isLastPar || maintext
-                       || (numpars > 1 && d->ownerCode() != CELL_CODE
-                           && (inInset().getLayout().isDisplay()
-                               || parInline)))
-                   && !style.isCommand()) {
-                       needPar = true;
-               }
 #ifdef FIXED_LANGUAGE_END_DETECTION
                if (next_) {
                        running_font.latexWriteEndChanges(os, bparams,
@@ -2885,11 +2958,11 @@ void Paragraph::latex(BufferParams const & bparams,
                running_font.latexWriteEndChanges(os, bparams, runparams,
                                basefont, basefont, needPar);
 #endif
-               if (needPar) {
-                       // The \par could not be inserted at the same nesting
-                       // level of the font size change, so do it now.
-                       os << "{\\" << font.latexSize() << "\\par}";
-               }
+       }
+       if (needPar) {
+               // The \par could not be inserted at the same nesting
+               // level of the font size change, so do it now.
+               os << "{\\" << font.latexSize() << "\\par}";
        }
 
        column += Changes::latexMarkChange(os, bparams, runningChange,
@@ -3258,19 +3331,16 @@ std::tuple<vector<xml::FontTag>, vector<xml::EndFontTag>> computeDocBookFontSwit
 } // anonymous namespace
 
 
-void Paragraph::simpleDocBookOnePar(Buffer const & buf,
-                                    XMLStream & xs,
-                                    OutputParams const & runparams,
-                                    Font const & outerfont,
-                                    bool start_paragraph, bool close_paragraph,
-                                    pos_type initial) const
+std::vector<docstring> Paragraph::simpleDocBookOnePar(Buffer const & buf,
+                                                      OutputParams const & runparams,
+                                                      Font const & outerfont,
+                                                      pos_type initial,
+                                                      bool is_last_par,
+                                                      bool ignore_fonts) const
 {
-       // track whether we have opened these tags
+       // Track whether we have opened these tags
        DocBookFontState fs;
 
-       if (start_paragraph)
-               xs.startDivision(allowEmpty());
-
        Layout const & style = *d->layout_;
        FontInfo font_old =
                        style.labeltype == LABEL_MANUAL ? style.labelfont : style.font;
@@ -3281,48 +3351,88 @@ void Paragraph::simpleDocBookOnePar(Buffer const & buf,
        vector<xml::FontTag> tagsToOpen;
        vector<xml::EndFontTag> tagsToClose;
 
-       // parsing main loop
+       std::vector<docstring> generatedParagraphs;
+       DocBookFontState old_fs = fs;
+       odocstringstream os;
+       auto * xs = new XMLStream(os); // XMLStream has no copy constructor: to create a new object, the only solution
+       // is to hold a pointer to the XMLStream (xs = XMLStream(os) is not allowed once the first object is built).
+
+       // When a font tag ends with a space, output it after the closing font tag. This requires to store delayed
+       // characters at some point.
+       std::vector<char_type> delayedChars;
+
+       // Parsing main loop.
        for (pos_type i = initial; i < size(); ++i) {
-               // let's not show deleted material in the output
+               // Don't show deleted material in the output.
                if (isDeleted(i))
                        continue;
 
-               Font const font = getFont(buf.masterBuffer()->params(), i, outerfont);
-
-               // Determine which tags should be opened or closed.
-               tie(tagsToOpen, tagsToClose) = computeDocBookFontSwitch(font_old, font, default_family, fs);
-
-               // FIXME XHTML
-               // Other such tags? What about the other text ranges?
+               // If this is an InsetNewline, generate a new paragraph. Also reset the fonts, so that tags are closed in
+               // this paragraph.
+               if (getInset(i) && getInset(i)->lyxCode() == NEWLINE_CODE) {
+                       if (!ignore_fonts)
+                               xs->closeFontTags();
+
+                       // Output one paragraph (i.e. one string entry in generatedParagraphs).
+                       generatedParagraphs.push_back(os.str());
+
+                       // Create a new XMLStream for the new paragraph, completely independent from the previous one. This implies
+                       // that the string stream must be reset.
+                       os.str(from_ascii(""));
+                       delete xs;
+                       xs = new XMLStream(os);
+
+                       // Restore the fonts for the new paragraph, so that the right tags are opened for the new entry.
+                       if (!ignore_fonts) {
+                               font_old = outerfont.fontInfo();
+                               fs = old_fs;
+                       }
+               }
 
-               vector<xml::EndFontTag>::const_iterator cit = tagsToClose.begin();
-               vector<xml::EndFontTag>::const_iterator cen = tagsToClose.end();
-               for (; cit != cen; ++cit)
-                       xs << *cit;
+               // Determine which tags should be opened or closed regarding fonts.
+               Font const font = getFont(buf.masterBuffer()->params(), i, outerfont);
+               if (!ignore_fonts) {
+                       tie(tagsToOpen, tagsToClose) = computeDocBookFontSwitch(font_old, font, default_family, fs);
+
+                       // FIXME XHTML
+                       // Other such tags? What about the other text ranges?
+
+                       vector<xml::EndFontTag>::const_iterator cit = tagsToClose.begin();
+                       vector<xml::EndFontTag>::const_iterator cen = tagsToClose.end();
+                       for (; cit != cen; ++cit)
+                               *xs << *cit;
+
+                       // Deal with the delayed characters *after* closing font tags.
+                       if (!delayedChars.empty()) {
+                               for (char_type c: delayedChars)
+                                       *xs << c;
+                               delayedChars.clear();
+                       }
 
-               vector<xml::FontTag>::const_iterator sit = tagsToOpen.begin();
-               vector<xml::FontTag>::const_iterator sen = tagsToOpen.end();
-               for (; sit != sen; ++sit)
-                       xs << *sit;
+                       vector<xml::FontTag>::const_iterator sit = tagsToOpen.begin();
+                       vector<xml::FontTag>::const_iterator sen = tagsToOpen.end();
+                       for (; sit != sen; ++sit)
+                               *xs << *sit;
 
-               tagsToClose.clear();
-               tagsToOpen.clear();
+                       tagsToClose.clear();
+                       tagsToOpen.clear();
+               }
 
                if (Inset const * inset = getInset(i)) {
                        if (!runparams.for_toc || inset->isInToc()) {
                                OutputParams np = runparams;
                                np.local_font = &font;
-                               // If the paragraph has size 1, then we are in the "special
-                               // case" where we do not output the containing paragraph info.
-                               // This "special case" is defined in more details in output_docbook.cpp, makeParagraphs. The results
-                               // of that brittle logic is passed to this function through open_par.
-                               if (!inset->getLayout().htmlisblock() && size() != 1) // TODO: htmlisblock here too!
-                                       np.docbook_in_par = true;
-                               inset->docbook(xs, np);
+
+                               // TODO: special case will bite here.
+                               np.docbook_in_par = true;
+                               inset->docbook(*xs, np);
                        }
                } else {
                        char_type c = getUChar(buf.masterBuffer()->params(), runparams, i);
-                       xs << c;
+                       if (lyx::isSpace(c) && !ignore_fonts)
+                               delayedChars.push_back(c);
+                       else
+                               *xs << c;
                }
                font_old = font.fontInfo();
        }
@@ -3330,11 +3440,24 @@ void Paragraph::simpleDocBookOnePar(Buffer const & buf,
        // FIXME, this code is just imported from XHTML
        // I'm worried about what happens if a branch, say, is itself
        // wrapped in some font stuff. I think that will not work.
-       xs.closeFontTags();
-       if (runparams.docbook_in_listing)
-               xs << xml::CR();
-       if (close_paragraph)
-               xs.endDivision();
+       if (!ignore_fonts)
+               xs->closeFontTags();
+
+       // Deal with the delayed characters *after* closing font tags.
+       if (!delayedChars.empty())
+               for (char_type c: delayedChars)
+                       *xs << c;
+
+       // In listings, new lines (i.e. \n characters in the output) are very important. Avoid generating one for the
+       // last line to get a clean output.
+       if (runparams.docbook_in_listing && !is_last_par)
+               *xs << xml::CR();
+
+       // Finalise the last (and most likely only) paragraph.
+       generatedParagraphs.push_back(os.str());
+       delete xs;
+
+       return generatedParagraphs;
 }
 
 
@@ -3769,8 +3892,8 @@ bool Paragraph::isHardHyphenOrApostrophe(pos_type pos) const
        char_type const c = d->text_[pos];
        if (c != '-' && c != '\'')
                return false;
-       int nextpos = pos + 1;
-       int prevpos = pos > 0 ? pos - 1 : 0;
+       pos_type nextpos = pos + 1;
+       pos_type prevpos = pos > 0 ? pos - 1 : 0;
        if ((nextpos == psize || isSpace(nextpos))
                && (pos == 0 || isSpace(prevpos)))
                return false;
@@ -3811,9 +3934,6 @@ bool Paragraph::needsCProtection(bool const fragile) const
                Inset const * ins = getInset(i);
                if (ins->needsCProtection(maintext, fragile))
                        return true;
-               if (ins->getLayout().latextype() == InsetLayout::ENVIRONMENT)
-                       // Environments need cprotection regardless the content
-                       return true;
                // Now check math environments
                InsetMath const * im = getInset(i)->asInsetMath();
                if (!im || im->cell(0).empty())
@@ -4013,12 +4133,12 @@ void Paragraph::setPlainLayout(DocumentClass const & tc)
 }
 
 
-void Paragraph::setPlainOrDefaultLayout(DocumentClass const & tclass)
+void Paragraph::setPlainOrDefaultLayout(DocumentClass const & tc)
 {
        if (usePlainLayout())
-               setPlainLayout(tclass);
+               setPlainLayout(tc);
        else
-               setDefaultLayout(tclass);
+               setDefaultLayout(tc);
 }
 
 
@@ -4247,10 +4367,8 @@ void Paragraph::changeCase(BufferParams const & bparams, pos_type pos,
                }
 
                int erasePos = pos - changes.size();
-               for (size_t i = 0; i < changes.size(); i++) {
-                       insertChar(pos, changes[i].first,
-                                  changes[i].second,
-                                  trackChanges);
+               for (auto const & change : changes) {
+                       insertChar(pos, change.first, change.second, trackChanges);
                        if (!eraseChar(erasePos, trackChanges)) {
                                ++erasePos;
                                ++pos; // advance
@@ -4273,9 +4391,12 @@ int Paragraph::find(docstring const & str, bool cs, bool mw,
                // Ignore "invisible" letters such as ligature breaks
                // and hyphenation chars while searching
                while (pos < parsize - 1 && isInset(pos)) {
+                       Inset const * inset = getInset(pos);
+                       if (!inset->isLetter())
+                               break;
                        odocstringstream os;
-                       getInset(pos)->toString(os);
-                       if (!getInset(pos)->isLetter() || !os.str().empty())
+                       inset->toString(os);
+                       if (!os.str().empty())
                                break;
                        pos++;
                }
@@ -4469,7 +4590,18 @@ Language * Paragraph::Private::locateSpellRange(
        while (last < to && samelang && sameinset) {
                // hop to end of word
                while (last < to && !owner_->isWordSeparator(last)) {
-                       if (owner_->getInset(last)) {
+                       Inset const * inset = owner_->getInset(last);
+                       if (inset && dynamic_cast<const InsetSpecialChar *>(inset)) {
+                               // check for "invisible" letters such as ligature breaks
+                               odocstringstream os;
+                               inset->toString(os);
+                               if (os.str().length() != 0) {
+                                       // avoid spell check of visible special char insets
+                                       // stop the loop in front of the special char inset
+                                       sameinset = false;
+                                       break;
+                               }
+                       } else if (inset) {
                                appendSkipPosition(skips, last);
                        } else if (owner_->isDeleted(last)) {
                                appendSkipPosition(skips, last);
@@ -4695,7 +4827,7 @@ void Paragraph::spellCheck() const
                        // start the spell checker on the unit of meaning
                        docstring word = asString(first, last, AS_STR_INSETS + AS_STR_SKIPDELETE);
                        WordLangTuple wl = WordLangTuple(word, lang);
-                       SpellChecker::Result result = word.size() ?
+                       SpellChecker::Result result = !word.empty() ?
                                speller->check(wl) : SpellChecker::WORD_OK;
                        d->markMisspelledWords(first, last, result, word, skips);
                        first = ++last;