If specify pixel Zoom to (1, -1), then call glCopyImage, glCopyImage will hang up and does not return. Running attachment #9472 [details] ( https://bugs.freedesktop.org/attachment.cgi?id=9472&action=view ) can reproduce this bug.
fixed in e54329233522591bbe8aad8a3fd6bcdc1e430f03
Mass version move, cvs -> git
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