D27471: [plasma-session] Avoid potential race condition starting a service

[David Edmundson]

davidedmundson created this revision.
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REVISION SUMMARY
  If for some reason a service is started before StartServiceJob runs, we
  will end up blocking forever.

TEST PLAN
  Logged in

REPOSITORY
  R120 Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D27471

AFFECTED FILES
  startkde/plasma-session/startup.cpp
  startkde/plasma-session/startup.h

To: davidedmundson, #plasma
Cc: plasma-devel, Orage, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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