D20417: Add invokable public API for emitting contextualActionsAboutToShow

[David Edmundson]

davidedmundson created this revision.
davidedmundson added a reviewer: Plasma.
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REVISION SUMMARY
  This signal is emitted just before showing the context menu to allow
  lazy-loading expensive actions like hasAlternatives.
  
  This emitted by our code whenever we show a context menu from an event
  filter, however we want to use this code from a tooltip in D17410 <https://phabricator.kde.org/D17410>

TEST PLAN
  Hovered over some applets, they correctly enabled/disabled the 
  alternatives button

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20417

AFFECTED FILES
  src/scriptengines/qml/plasmoid/appletinterface.cpp
  src/scriptengines/qml/plasmoid/appletinterface.h

To: davidedmundson, #plasma
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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