Proper lifetime support for one-time menu objects with contextMenuExtension
Summary:
Adapt to kdevplatform change and use available parent widget for
QObject memory management of per-context-menu created QAction & QMenu
objects
Reviewers: KDevelop, kfunk
Reviewed By: KDevelop, kfunk
Subscribers: kdevelop-devel
Differential Revision: https://phabricator.kde.org/D6770