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In Firefox and Webkit a releasing the mouse-button outside of the document is not recognized. Therefore all drag&drop-like operations and the abandon-behavior of buttons does not work correctly afterwards. This should be fixed by faking a mouseup on reentry into the document.
Seems this wont be possible: There is no way to detect on a mouseMove event if a button is pressed or not. The only browser where this is possible is IE, which alrady does it in our current implementation. It should be possible to detect the mouse leaving the document and fire a mouseup then, but this would only shift the problem from potentially missed mouse-events to potentially wrongfully added mouse events. It would mean that any DND-operations will be aborted if the mouse leaves the browser, which is a no go in my opinion. This issue is most promimently visible with the new non-native scrollbars: Scrolling from one end of an area to another is often done by dragging the thumb all the way to its limit in anexaggerated movement, leaving the browser-window. perhaps we could implement a scrollbar-specific solution: Release the scrollbar on its current position if the mouse leaves the browser, but fake no mouseup for any of the other widgets.
