Comment 7 for bug 1294864

This is Compiz issue and was introduced by this MP: https://code.launchpad.net/~3v1n0/compiz/extents-clamp-workarea/+merge/210202

That MP is protecting against bleeding the window's extents into another work area. Since the extents allow for mouse grabbing window resizing, there is a small gap allowing for the window to be resized.

I don't think that MP took into account semi-maximized windows. I'll take a look and see if we can discount the extent when semi-maximized.