User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:30.0) Gecko/20100101 Firefox/30.0 (Beta/Release) Build ID: 20140605174243 Steps to reproduce: I pasted text in a textarea of an IMDb submission page with the middle mouse button. Actual results: There was an incorrect redraw below this textarea. Snapshot attached. Expected results: A redraw wasn't even needed AFAIK.
I could reproduce it two other times. The last one was not with a middle click, but when clicking on a form button. When switching the desktop and coming back, the incorrect rendering is still present, but scrolling makes it disappear.
QA Whiteboard: [bugday-20140630]
Component: Untriaged → Graphics
Product: Firefox → Core
Editing text in StackExchange yields similar problems (always reproducible). I'm not sure whether this is related.
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