When a windowless plugin changes the cursor, it sometimes does not change back when mouse back over the view. No amount of clicking around can fix the cursor. This can be observed by mousing around Source/WebCore/manual-tests/plugins/windowless.html.
Created attachment 84331 [details]
Comment on attachment 84331 [details]
View in context: https://bugs.webkit.org/attachment.cgi?id=84331&action=review
> + xEvent->xany.window = None; // Mozilla also sends None here for windowless plugins. See nsObjectFrame.cpp in the Mozilla sources.
It's worth clarifying in the code/ChangeLog that we also use this for windowed plugins but that it is fine to use None anyway.
Committed r80429: <http://trac.webkit.org/changeset/80429>