[Differential] [Request, 13 lines] D3319: Load screenpool at the same time as we connect to screenchanged signals

[davidedmundson (David Edmundson)]

davidedmundson created this revision.
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REVISION SUMMARY
  Otherwise we have a gap during load (waiting querying kactivities))
  between screen pool being created and us connecting to the screen
  changed signals, which in turn are used to update screen pool.
  
  In particular the primary screen can get out of sync between the current
  state and the screen pool.

TEST PLAN
  Based on Christopher Feck's research and initial patch

REPOSITORY
  rPLASMAWORKSPACE Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D3319

AFFECTED FILES
  shell/screenpool.cpp
  shell/screenpool.h
  shell/shellcorona.cpp

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: davidedmundson, #plasma
Cc: plasma-devel, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas
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