When I released ImageTweak 0.19 I wrote in the changelog that the main change was the support for proper image drag&drop.
It actually works correctly but this change had the side effect of changing the normal mouse pointer used by ImageTweak to indicate that you’re moving an image around the window. I noticed this before releasing the update, but it seemed like a minor annoyance worth the additional functionality. I actually tried to fix it but found no way, and since there were a lot of people writing negative reviews on AMO for the lack of drag&drop support I decided to release it without fixing it.
Fast forward some weeks, and it turns out that actually the new behaviour is quite confusing and many are complaining about the mouse pointer showing the “forbidden” shape while moving the image. Fewer than they were complaining before about the lack of drag&drop, but still…
So I set out to find a solution for this problem but apparently there’s no way to freely control the mouse pointer shape during a drap&drop operation. The only thing that comes closer is setting the mozCursor property of the DOMDataTransfer interface to “default”, but that works only on win32 and simply switch the cursor from “forbidden” to the default arrow.
I’m therefore pretty much stuck in a fix: I have to fix this problem but I have no idea of how. If you know how to do this, or know somebody that might help me in fixing this, please let me know.