D8100: Workaround crash on lockscreen close

[David Edmundson]

davidedmundson created this revision.
davidedmundson added a reviewer: Plasma.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  See QTBUG-55460 for details. It's causing our unit test crash when
  closing the lock screen with SIGTERM.
  
  It's not worth fixing "properly" as it goes away with QtQuickControls2

TEST PLAN
  gdb showed it was this crash, which I'd seen before
  
  Ran locker --test
  sent SIGTERM
  locker closed, but didn't crash

REPOSITORY
  R133 KScreenLocker

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8100

AFFECTED FILES
  greeter/greeterapp.cpp

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