Comment 9 for bug 802527

This is even worse than I thought.

If you have two windows maximized for the same application, and you switch to that application, the wrong window is maximized in the foreground. If you click the close title-bar icon, it closes the window behind it, not the one that is currently maximized.

I just lost a ton of work because of this bug as Ubuntu closed my window with all my unsaved changes instead of the window maximized on top with no changes.