D10359: [Mouse KCM] Check libinput Atom availability before using them

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, romangg, xuetianweng.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  Otherwise the KCM aborts on XWayland.
  
  CHANGELOG: Fixed mouse settings module crashing on Wayland
  
  BUG: 389978
  FIXED-IN: 5.12.1

TEST PLAN
  KCM starts fine on Wayland now, previously it would quit with `BadAtom` error

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D10359

AFFECTED FILES
  kcms/input/backends/x11/x11mousebackend.cpp

To: broulik, #plasma, romangg, xuetianweng
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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