D8963: [Containment Interface] Set WA_TranslucentBackground before accessing winId()

[Kai Uwe Broulik]

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

REVISION SUMMARY
  This would create the surface after which this flag has no effect causing menus to have black rounded corners.
  
  CCBUG: 385311

TEST PLAN
  I have nice rounded menus in Breeze and Oxygen again on panel and desktop. `PlasmaComponents.Menu` needs a separate fix

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D8963

AFFECTED FILES
  src/scriptengines/qml/plasmoid/containmentinterface.cpp

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