D5239: [Plasma Windowed] Emit contextualActionsAboutToShow before showing them

[Kai Uwe Broulik]

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

REVISION SUMMARY
  Applets might populate the menu only on demand.

TEST PLAN
  Right clicking now shows actions properly in media controller

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D5239

AFFECTED FILES
  plasma-windowed/plasmawindowedview.cpp

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