D15869: Fallback to in-process prompt if logout prompt fails

[David Edmundson]

davidedmundson created this revision.
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REVISION SUMMARY
  KSmserver is currently very heavily tied to the shutdown prompt dialog.
  On upgrades a user ends up in a situation where they have an old
  ksmserver running but a newer shutdown dialog. This has caused issues
  repeatedly in the past.
  
  I want to make some changes to how the shutdown prompt is shown for
  5.15. First step is making the old releases more robust.
  
  Prompt looks ugly but a user will only see it at most once. Hopefully
  never.

TEST PLAN
  rm'd the greeter
  Got an ugly messagebox instead of nothing

REPOSITORY
  R120 Plasma Workspace

BRANCH
  logout_prompt

REVISION DETAIL
  https://phabricator.kde.org/D15869

AFFECTED FILES
  ksmserver/shutdown.cpp

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