D7127: ignore spurious resize events to empty sizes

[Marco Martin]

mart created this revision.
Restricted Application added projects: Plasma, Frameworks.
Restricted Application added subscribers: Frameworks, plasma-devel.

REVISION SUMMARY
  on multiscreen systems, the notification dialog gets resized to 0x0
  right after componentcomplete by someone else (either kwin, notification
   applet  or Qt code) causing 382340, resizing a window to a null size is not correct anyways
  and should never happen.
  with this, all other resize events are correct and notifications are ok on multiscreen
  systems
  
  BUG:382340

TEST PLAN
  system with primary monitor and panel in the external monitor
  at the right of a panel, notifications are fine

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7127

AFFECTED FILES
  src/plasmaquick/dialog.cpp

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