75
Drag and Drop is an absolute mess
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Sounds like your issue is mostly flatpak, to me.
Only issue I have with drag and drop is any wine game I am playing assumes the file is for them, and jumps to the foreground if the cursor passes over it while dragging. If I accidentally drop it, dragging stops working in the drag source app. Sure, this wouldn't be an issue if I were not sharing and moving files mid-game, but that is my wont.