D10802: Fix the userswitcher when using the mouse for switching

[Fabian Vogt]

fvogt created this revision.
fvogt added a reviewer: Plasma.
Restricted Application added a project: Plasma.
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REVISION SUMMARY
  Clicking on a button makes Qt grab the pointer, which means the screen can't be
  locked. As we wait for the screen to be locked before switching, this never
  happens.
  
  BUG: 391007

TEST PLAN
  Previously the userswitcher only worked on every second try, now it works
  always on the first click.

REPOSITORY
  R120 Plasma Workspace

BRANCH
  Plasma/5.12

REVISION DETAIL
  https://phabricator.kde.org/D10802

AFFECTED FILES
  ksmserver/switchuserdialog.cpp

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