!!Interface changes
+- It is now possible to cancel background export processes. A menu entry
+ to do so will appear on the Document menu when such a process is underway.
+ The LFUN for this is export-cancel.
!!Documents compilation process and images conversion
!!!The following pref variables are obsoleted in 2.4:
+* \font_encoding
+ The font encoding is now automatically set depending on the document
+ fonts and languages.
+
* \use_qimage
This is no longer necessary due to the rewrite of the painter.
+* \use_pixmap_cacheqimage
+ There is no evidence that this painting mode was useful anymore.
+
+* \date_insert_format
+ The function date-insert has been removed and superseded by info-insert date.
+ The latter does not need a pref value anymore.
+
!!!The following new LyX functions have been introduced in 2.4:
+* export-cancel: Used to cancel background export processes.
!!!The following LyX functions have been changed in 2.4:
+* set-graphics-group was renamed to graphics-set-group.
+
+* info-insert buffer vcs-*: renamed to info-insert vcs *
+
+
+!!!The following LyX functions have been removed in 2.4:
+
+* date-insert: obsoleted by info-insert date.
+
!!!The following LyX documents have been moved in 2.4:
!!Changes with respect to external programs and libraries in 2.4:
+* The Qt5 libraries are now used by default. In order to link against
+ Qt4 the configure option --disable-qt5 has to be used.
+
!!Known issues in version 2.4.0
!!Caveats when upgrading from earlier versions to 2.4.x
+* Autotools monolithic build option for building LyX binaries was removed,
+ for compilation speedup use parallel building on multiple cores instead.
+
+!! If upgrading from a LyX version before 2.3.0
+
+* Please additionally see the release notes from the versions in-between:
+ https://wiki.lyx.org/LyX/ReleaseNotes
+* Several ttf fonts (esint10.ttf, stmary10.ttf, wasy10.ttf) were changed
+ to reflect the fact that newer Qt libraries do not support displaying certain
+ codepoints anymore (bug #8493, #10161).
+ Distribution packagers need to repack those font files in case they are
+ delivering the fonts as a separated package dependent from core LyX.