Comment 5 for bug 723878

Description copied from dup, I think the window placement code is right, but the addition of the shade frame (then being see by the Launcher as part of the window) is what is initiating the hide:

  Starting with a clean desktop and launching a single application (eg. Ctrl-Alt-t for a Terminal) this causes the Launcher to always immediately hide.

  It appears that the window itself is being aligned to not overlap with the Launcher, but that the shadow around it on the left-hand-side overlaps with the Launcher. Ideally the Launcher should not take outside/shadow space into consideration when determining if to hide.