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[Jean-Marc Lasgouttes <1811571@xxxxxxxxxxxxxxxxxx>]

I am one of the upstream developers. What I can say about this 2.2.4
version is

* we have unit tests for the code, but I would not qualify them as
extensive

* as of versions 2.2.x, we have a rather extensive test repository that
checks whether our file export routines (which is the main purpose of
LyX after all) work well.

* as the last release of the 2.2.x series, LyX 2.2.4 has been build very
conservatively, so that it would not introduce new problems. It does fix
56 bugs, among which crashes like bug #1737429.

* I do not remember of any new problem introduced in 2.2.4.
Unfortunately, we did not create a "2.2.4" version in our bug tracker,
so I cannot substantiate that.

* the only new feature is the possibility to read/write LyX 2.3.x files,
which is very valuable in itself.

I am not sure this fulfill the SRU rules, but I want to emphasize that
long term releases is the main  target of a release such as this one. We
have a stable release manager whose job is to sure that people can
upgrade stable releases with low risk, and is twice as cautious for the
last one in a series.

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https://bugs.launchpad.net/bugs/1811571

Title:
  [SRU] Update to maintenance release 2.2.4 in Bionic

Status in lyx package in Ubuntu:
  Fix Released
Status in lyx source package in Bionic:
  New

Bug description:
  IMPACT
  -------
  http://www.lyx.org/announce/2_2_4.txt

  LyX 2.2.4 is the fourth and final maintenance release in the 2.2.x series.
  You can download LyX 2.2.4 from http://www.lyx.org/Download/.

  LyX 2.2.4 is the result of ongoing efforts to make our stable version
  more reliable and more stable. We have fixed a number of bugs and made
  several improvements.

  What's new
  ==========

  ** Updates:
  ***********

  * USER INTERFACE

  - On Windows, allow to automatically bring the LyX window to top (bug
  10469).

  - Cache information on exportable formats (bug 9980).

  - Shorten the time required to save the session state on exit.

  * DOCUMENTATION AND LOCALIZATION

  - Updated Arabic, Czech and Japanese user interface localization.

  * BUILD/INSTALLATION

  - Mark some intentional fall-throughs in order to silence false
  -Wimplicit-fallthrough warnings with gcc7.

  ** Bug fixes:
  *************

  * DOCUMENT INPUT/OUTPUT

  - Fix wrong spacing in output when the font size is changed inside a
  center environment or a greyed out note (bugs 9598 and 10650).

  - Assure properly nested \begin{lang} and \end{lang} tags even when no
  language package is selected (bug 10685).

  - Catch "! Incomplete \if[x]" LaTeX error (bug 10666).

  - Ignore LaTeX error on missing ZWNJ (ligature break) characters (bug
  10727).

  - Fix PDF output of clipped graphics with recent graphics package (bug
  7910).

  - Catch xdvipdfmx driver error that breaks XeTeX compilation (bug
  10076).

  - Fix caption handling in listings insets when it is split into
  multiple lines in the LaTeX output (bug 10705).

  - Do not let the natbibapa module overwrite what the class or other
  packages add to the preamble.

  - Assure the color package is loaded before polyglossia in preview
  snippets. This fixes preview image generation with polyglossia and
  bidi (bug 10716).

  - Fix babel name of Vietnamese language. This requires now babel-
  vietnamese (2013ff.) instead of vietnam.ldf that was shipped with
  vntex previously (bug 10743).

  - Fix issue with language nesting when using Asian languages (bug
  10778).

  - Fix bug that TeX files were not detected when reconfiguring LyX (bug
  11053).

  * USER INTERFACE

  - Fix crash occurring in certain circumstances when previewing the
  source of a single paragraph containing a language switch (bug 10636).

  - Fix crash when closing master file with full view source open (bug
  10560).

  - Fix crash when closing master document with dirty child while
  Document Settings dialog is open (bug 9979).

  - Fix crash when closing master with children and grandchildren (bug
  10766).

  - Fix crash when pasting multiple cells into a multi-paragraph cell of
  a table (bug 9983).

  - Fix random crash when dissolving inset (bug 10667).

  - Fix potential crash when cursor enters an inset (bug 10691).

  - Avoid crash when selecting long text (bug 10324).

  - Fix crash with undo and child documents (bug 10643).

  - Fix completely broken undo in Advanced Find & Replace edit areas
  (bug 10847).

  - Fix crash when changing preview preferences while previewable
  external inset is open (bug 10785).

  - Fix problem with decimal special height/width values in the Box
  dialog in some localizations (bug 11000).

  - Remove duplicate entries from the Symbols dialog (bug 10644).

  - Always show the float type in the float inset label (bug 10618).

  - Show correct color name for green in the status bar (bug 10656).

  - fixes to cursor positioning on mouse click for right-to-left text
  (bug 10569).

  - Fix metrics of full-width insets when paragraph endings are shown
  (bug #10537).

  - Fix glacial performance with ancient Hebrew text on macOS.

  - Fix hole in selection for some zoom and justification values (bug
  8883).

  - Fix some rare cases of bad on-screen line breaking (bug #10700).

  - Fix bad justification before a displayed inset (bug 10699).

  - Fix selection display glitch with paragraph label (bug 10972).

  - Fix cursor state after double/triple click in mathed (bug #10686).

  - Avoid a case of stuck cursor after entering an inset (bug 10630).

  - Fix problems with hidden "BibTeX Add" dialogs on MacOSX by using
  drawers instead of modal subdialogs (bug 10662).

  - Don't swallow labels not entered through the toolbar in mathed (bug
  10546).

  - Fix bad context menu on insets that do not have one (bug 10616).

  - Enable OK/Apply buttons when resetting to class defaults.

  - Fix untranslated GUI string in Box dialog (bug 10999).

  - Fix untranslated GUI strings on View/Update toolbar button menu (bug
  11040).

  - When entering a math macro name, Escape properly cancels the
  operation (bug 9251).

  * INTERNALS

  - Fix execution of set-graphics-group function.

  * DOCUMENTATION AND LOCALIZATION

  - Fix loading of math packages in many manuals (bug 10661).

  - Add note that the fixltx2e package (and so module) is obsolete as of
  TeXLive 2015 (bug 9361).

  - Updated French user interface localization.

  * TEX2LYX

  - Fix import of \newtheorem* declarations (bug 10622).

  - Fix import of (specific) BibTeX paths (bug 7637).

  - Fix import of flalign* environment (bug 10501).

  * BUILD/INSTALLATION

  - Update tex2lyx tests (bug 10800).

  
  TEST CASE
  ----------
  Open a previous .lyx file with the new version in bionic-proposed, which was written by 2.2.3, and read, modify, write changes in it then try to view it in PDF and export into other formats.

  
  REGRESSION POTENTIAL
  ---------------------
  The only new feature of 2.2.4 is that it is able to read and write files in the 2.3.x format. Please note, however, that the conversion process back and forth usually will not leave one with an identical file, so we do not recommend that users of 2.2.4 try to collaborate with users of 2.3.x.

  Version 2.2.3 in Bionic now cannot even read or write in 2.3.x format
  so users of Bionic already know that they cannot collaborate with
  2.3.x users. So the regression potential is low.

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