D5773: [WIP] workarounds for menu positioning

[Marco Martin]

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

REVISION SUMMARY
  this ensure two things:
  
  - submenus have the main menu as transientParent
  - the visualParent window() is used as transientParent, if exists
  
  this partly fixes popup positioning in wayland, tough
  the main taskbar menu is still mis positioned

TEST PLAN
  submenus ok, taskbar contextmenus only partially fixed

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  phab/menuposworkaround

REVISION DETAIL
  https://phabricator.kde.org/D5773

AFFECTED FILES
  src/declarativeimports/plasmacomponents/qmenu.cpp

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