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Summary: This commit adds "What's This?" help to nearly everything in the Dolphin main window (panels, views, buttons, ...). It adds the "?" to the title bar so this help can easily be called. For links in those help texts to work the WhatsThisClickedEvents are handled in the main window class. This doesn't work for menus because events from them aren't forwarded to the main window for some reason so EventFilters are installed for the Control button menus. Modifying the "Help" menu of KXmlGui is deprecated so no EventFilter can be installed in the menubar. Therefore help texts without links are provided for the menubar. Test Plan: Check if the event handling might make any problems. Check for any big mistakes in the help messages. Reviewers: #dolphin, elvisangelaccio Subscribers: broulik, elvisangelaccio, yurchor, kfm-devel Tags: #dolphin Differential Revision: https://phabricator.kde.org/D20471
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