D8284: Don't duplicate connect to wl_display_flush

[David Edmundson]

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

REVISION SUMMARY
  When using the QPA's wl_display, we don't need to also flush when the
  event dispatcher blocks, as Qt's QPA already does this.
  
  This also fixes a warning on startup about a null parameter when our QPT
  creates a connectionThread before the eventDispatcher is created.

TEST PLAN
  Confirmed the Qt wayland QPA has the same connect to the event dispatcher
  
  Ran app:
  No more warning
  Still had correct window decorations

REPOSITORY
  R127 KWayland

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8284

AFFECTED FILES
  src/client/connection_thread.cpp
  src/client/connection_thread.h

To: davidedmundson
Cc: plasma-devel, #frameworks, leezu, ZrenBot, alexeymin, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, eliasp, sebas, apol, mart, hein
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