D5330: [QDBusMenuBar] Don't wait for (un)register call to finish

[Kai Uwe Broulik]

broulik created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

TEST PLAN
  I still get menus in both KDE and Qt-only apps, we no loner spend 0.4ms blocking on startup. The initial check whether dbus menu is supported needs to be sync as the createPlatformMenuBar method needs to return a menu right away.
  
  When we reparent the menu bar we do unregister and then register, is it guaranteed that these calls will arrive in order?

REPOSITORY
  R135 Integration for Qt applications in Plasma

REVISION DETAIL
  https://phabricator.kde.org/D5330

AFFECTED FILES
  src/platformtheme/qdbusmenubar.cpp

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