Improve DnD handling in read-only dirs
- Dropping in a read-only dir now won't create a KIO job, and won't show a menu.
- Dragging over read-only dirs in the tabbar or Places panel will show a stop sign, just as in the main view and Folder panel.
Possible problems:
DragAndDropHelper::supportsDropping()
creates a new KFileItem
in each DragMoveEvent
. Perhaps it should be cached, but I don't see any slowdown or CPU peak on my machine.
TODO: Breadcrumbs should also do 2, but it's too complex for me.