Patch by Florian Müllner for Metacity https://bugzilla.gnome.org/show_bug.cgi?id=607694 When dragging a window over a screen edge and dropping it there, maximize it vertically and scale it horizontally to cover the corresponding half of the current monitor. Whenever a "hot area" which triggers this behavior is entered, an indication of window's target size is displayed after a short delay to avoid distraction when moving a window between monitors.