D5900: use transientparent directly

[Marco Martin]

mart created this revision.
Restricted Application added a project: Frameworks.
Restricted Application added a subscriber: Frameworks.

REVISION SUMMARY
  don't parent directly as we don't want unwanted deletions.
  ensure we have a menu, not parented yet, the container exists,
  both the menu and the container's toplevel widget QWindows exist,
  then set the transient parent of the qmenu's qwindow to the
  container's toplevel widget's qwindow. this fixes positioning in
  wayland as the protocol requires every popup menu having a transient parent

TEST PLAN
  okular doesn't crash anymore, konsole's bookmarks menu still
  correctly positioned in wayland

REPOSITORY
  R263 KXmlGui

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D5900

AFFECTED FILES
  src/kxmlguifactory_p.cpp

To: mart
Cc: #frameworks
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