Connect aboutToHide signal from QMenu to relevant libdbusmenu-qt slot
Summary:
This sends the close event to the client which then sends aboutToHide to
the QMenu.
Code was all there, just not hooked up
BUG: 375053
Test Plan: Added qDebug to the test app inside libdbusmenuqt
Reviewers: Plasma, markg, broulik
Reviewed By: Plasma, markg, broulik
Subscribers: broulik, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D5192