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Fix crash of KMix in Legacy Tray

Felix Ernst requested to merge felixernst/kxmlgui:fix_crash_kmix_legacy_tray into master

The main change of this commit is the replacement of a static_cast with a qobject_cast.

The code assumed falsely that QEvent::ToolTips are only ever sent to QWidgets. While the documentation implies that, there exists custom code even within Qt for sending and handling QEvent::ToolTips in QObjects that are not QWidgets.

QSystemTrayIcon and potential subclasses are examples of QObjects that handle ToolTip events even though they are not QWidgets.

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