the external_templates file, you will have to move the modifications to
the respective *.xtemplate file manually.
-* If you used literal em- and en-dashes in pre-2.2 documents,
- you must manually unselect
- "Document->Settings->Fonts->Output em- and en-dash as ligatures"
- to ensure unchanged behaviour.
+* By default, LyX 2.3 forces output of all en and em dashes as -- and ---
+ when exporting to LaTeX. This can lead to incorrect line breaks, wrong
+ characters in typewriter fonts, and problems with some LaTeX packages.
+ Unselect "Document->Settings->Fonts->Output em- and en-dash as ligatures"
+ to keep the LyX 2.2 behaviour and avoid these problems. See chapter 3.9.1.1
+ "Dashes and line breaks" of the User Guide for details.
* ZWSP characters (u200b) following literal em- and en-dashes are deleted by
lyx2lyx when converting to 2.3 format. If you used them as optional line
example, create a document with a title layout, then a standard layout, and
then an author layout, and you will see in the PDF that the author is not
typeset as an author.
+
+
+!! If upgrading from a LyX version before 2.2.0
+
+* Please additionally see the release notes from the versions in-between:
+ https://wiki.lyx.org/LyX/ReleaseNotes