[Differential] [Request, 27 lines] D3777: notice when the only screen changes

[mart (Marco Martin)]

mart created this revision.
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REVISION SUMMARY
  in a corner case that is used a lot, the internal laptop screen
  gets automatically disabled when an external screen is connected.
  the only QScreen* available from the QGuiApp gets recycled for the
  new screen and there is no signal this switch occurred.
  
  To work around this, as all the view get an expose event when this happen,
  monitor the rename of the desktopview's qscreen and manage this separatedly
  in the shell.
  
  BUG:373880

TEST PLAN
  connection and disconnecting an external screen to the laptop
  both in the case of internal screen enabled or disabled

REPOSITORY
  R120 Plasma Workspace

BRANCH
  phab/screenheuristic

REVISION DETAIL
  https://phabricator.kde.org/D3777

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

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

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