c671ff74c6
While modal dialogs were attached to the parent's titlebar, it made sense to leave the top of the parent window at full color. With the new position of modal dialogs, it makes more sense to dim the entire parent window, so we can use a combination of Clutter's BrightnessContrast- and DesaturateEffect instead of our own custom shader. https://bugzilla.gnome.org/show_bug.cgi?id=674499