I believe that this is the upstream issue:
https://bugs.kde.org/show_bug.cgi?id=415948
** Bug watch added: KDE Bug Tracking System #415948
https://bugs.kde.org/show_bug.cgi?id=415948
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: kate (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1884432
I have found how to reproduce the bug! PLEASE, REPAIR IT.
1) file ~/.local/share/applications/org.kde.kate.desktop contains blocks
in the following order and everything works as it should (Kate is
searchable in the dash and can be pinned to the dash bar):
[Desktop Entry]
...
[Desktop Action
So it seems that the org.kde.kate.desktop file was wrong, the [Desktop
Entry] block was generated at the end of the file instead at the top.
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** Attachment added: "the desktop file taken from Ubuntu 16.04 where it worked"
https://bugs.launchpad.net/ubuntu/+source/kate/+bug/1884432/+attachment/5385861/+files/org.kde.kate.desktop
** Description changed:
There are several issues with 'Kate' on my clean install of Ubuntu 20.04
** Attachment added: "No option to add to favorites or to open a new window"
https://bugs.launchpad.net/ubuntu/+source/kate/+bug/1884432/+attachment/5385859/+files/Sn%C3%ADmek%20z%202020-06-21%2015-13-16.png
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