!Important Changes in LyX 2.4.0


!!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 were added in 2.4:



!!!The following pref variables were changed in 2.4:



!!!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  The function date-insert has been removed and superseded by info-insert date.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:



!!!The following new folders have been added to the LyX directory



!!!The following preferences files have been removed from the tarball in 2.4:



!!!The following metadata files have been added to the tarball 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

* See http://www.lyx.org/trac/wiki/BugTrackerHome


!!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.