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Popups and other override-redirect windows are meaningless to everything that depends on the ShellWindowTracker. Ignoring those windows will result in less ShellApp::windows-changed signal emissions, and less activity in the AppMenuButton and everything else that depends on them. Reduces gnome-shell CPU activity while typing on the Epiphany addressbar, as the pop up animation there results in a number of xdg_popup being created and destroyed. GNOME/gnome-shell!642 GNOME/mutter#556
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