D22264: Always call into ksmserver DBus interface

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, davidedmundson.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  Previously, it would ask ksmserver to show the logout prompt and otherwise directly initate a logout through `libSM`.
  The latter got removed, which is a good thing, but now we need to always know ksmserver which should know what to do.

TEST PLAN
  Right click on desktop, click "Leave", get a prompt again now
  Disabled "confirm logout" in startup & shutdown KCM, right clikck on desktop, click "leave", logged out directly
  
  Clicked leave button in lock/logout applet, same correct behavior now

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D22264

AFFECTED FILES
  libkworkspace/kworkspace.cpp

To: broulik, #plasma, davidedmundson
Cc: plasma-devel, LeGast00n, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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