D8965: [PlasmaComponents Menu] Set WA_TranslucentBackground on the underlying QMenu

[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 ensures the menu can have nice round corners with Breeze and Oxygen. The same had already been done in ContainmentInterface's menu.
  
  CHANGELOG: Fixed an issue where PlasmaComponents Menu would appear with broken corners
  
  CCBUG: 385311

TEST PLAN
  Before
  F5506020: Screenshot_20171123_143209.png <https://phabricator.kde.org/F5506020>
  After
  F5506018: Screenshot_20171123_143140.png <https://phabricator.kde.org/F5506018>
  
  The effect is barely noticeable with Breeze as it has only a 1px border but it is still there and also fixed with this patch.

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D8965

AFFECTED FILES
  src/declarativeimports/plasmacomponents/qmenu.cpp

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