Drag&drop doesn't work reliably

[thibaultmol]

I think this worked before, but today I noticed that dragging multiple images doesn't work.
#1496 (maybe that's what I ran into here, but didn't realize)
one image works, but multiple images doesn't and just opens the image in the browser instead.
Tested in Firefox.
Svelt does detect the dragging in the console log btw

[thibaultmol]

• Actually, it just seems really finicky right now. I drag an image, and I see the svelts console logs that it's detecting the dragging. But often when I left go of the mouse, the image doesn't get uploaded and opens in the browser instead. As if it doesn't capture it somehow. it's very hit or miss if the drag works when I let go.
  (I am on linux, but haven't had any other websites show problems with drag and dropping images

[pietervdvn]

I did rework the drag&drop functionality; one can now use the entire popup as drop zone. I just tested it on desktop Linux with both Firefox (well, Librewolf) and Chromium and it seems to work fine with me.