D9171: Remove concept of multihead in kcminit

[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
  We don't remotely support multihead in plasmashell.
  Nor do we support two plasmashells running to fake it.
  SDDM doesn't either.
  
  Kwin has some code, but we don't check the screen before
  choosing the DBus service to use. I doubt it works well.
  
  This kills some code, and a blocking call to klauncher.
  
  (Note, multihead has nothing to do with xrandr spanning screens)

TEST PLAN
  Code grep
  Compiles

REPOSITORY
  R120 Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D9171

AFFECTED FILES
  startkde/kcminit/main.cpp

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