<rdar://problem/6757346> SAP: Prevent default on mouseDown does not stop...
<rdar://problem/6757346> SAP: Prevent default on mouseDown does not stop iframe from capturing subsequent mouse moves Reviewed by Darin Adler. This is the first step of allowing drag events to match the behaviour of mouse move events when the default action of the initial mouse down is prevented. Remaining issue is that the final mouse up event still targets the original root frame. Test: fast/events/mouse-drag-from-frame-to-other-frame.html git-svn-id: http://svn.webkit.org/repository/webkit/trunk@42760 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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