Make drags from the Task Manager less prone to disaster
Summary: The Task Manager applet previously set a task's launcher URL as generic URL MIME data of drags initiated from it. This made everything that's willing to handle an URL drop a drop target for drags from the Task Manager, which resulted e.g. in users accidentally dropping .desktop files into chat apps that would immediately send them as a message. In truth, the utility of drags initiated from the Task Manager is mostly confined to the shell: Adding apps to the desktop, to the panel, to launcher menus (we don't have this currently but should add it), and so on. It's therefore appropriate to use a special internal MIME type for this payload instead of one as generic as text/url. We already use special internal MIME types to shuttle around window ids (for drops onto pagers, to assign tasks to different virtual desktops or activities) and filter out drops onto the Task Manager applet itself. This patch makes the necessary changes in the Task Manager and in the Folder View containment, which needs special care due to its complex drop handling. A seperate patch will augment ContainmentInterface::processMimeData to take care of the Desktop and Panel containments (while compatible with the Folder View change). This is an implementation of an idea by David Edmundson posted in D13162. Reviewers: davidedmundson, Zren Subscribers: plasma-devel Tags: #plasma Differential Revision: https://phabricator.kde.org/D13274
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