Comment 7 for bug 948151

Here's a video of the behavior. Sometimes it actually does work properly. Usually this occurs after snapping the window to half the monitor and then resizing across the desktop (see ~1.5-2min), however I can't consistently reproduce it or sometimes get it to go back to the buggy behavior. Hope this helps. Sorry for the poor quality of the video (it was my first screencast and I scaled down to make it a smaller file size).
Ian