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This prevents normal application windows (and other kinds of windows) from being moved up in Z-order to be above windows that have the always-on-top bit set. Doing so would make the previously-normal windows in question also always-on-top implicitly. Windows that are already always-on-top will be restacked on top of other always-on-top windows too. https://bugzilla.gnome.org/show_bug.cgi?id=746745
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