Summary:
If the keymap cannot be created a few pointers in Xkb are null.
We should make sure to not call any xkbcommon functions on those
null pointers and instead use proper fallbacks.
This change introduces fixes for a few usages, but it's not unlikely
that there are more cases.
BUG: 381210
FIXED-IN: 5.10.3
Test Plan:
Autotest added for the condition of the bug, which does
not crash any more. Just starting the test found a few more crash
cases.
Reviewers: #kwin, #plasma
Subscribers: plasma-devel, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D6260
