Recommended update for lyx

This update for lyx fixes the following issues:

- Fixed possible menu shifting on GNOME Wayland (see upstream bug
https://www.lyx.org/trac/ticket/11746)

lyx was updated to 2.3.6:

* Small improvements and bug fixes all over the place. For
details see included ANNOUNCE
or https://www.lyx.org/announce/2_3_6.txt

Some highlights:

* On openSUSE: the correct mathfonts are now displayed
* Added the ability to create new child documents from within the
'include file' dialog
* Pasting table content outside a table no longer pastes tab
characters

- The package tablefootnote is needed by LyX to be able to output footnotes in floating tables
- Place the math fonts coming with LyX in a separate package and
install them in the system font directory. In this way fontconfig
finds them, which is half of the fix for the diplay of math fonts
in LyX. The other half comes with the next release

This update was imported from the openSUSE:Leap:15.2:Update update project.

Fixed bugs
Selected Binaries
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