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Alexander Larsson authored
An pass_through window is something you can draw in but does not affect event handling. Normally if a window has with no event mask set for a particular event then input events in it go to its parent window (X11 semantics), whereas if pass_through is enabled the window below the window will get the event. The later mode is useful when the window is partially transparent. Note that an pass-through windows can have child windows that are not pass-through so they can still get events on some parts. Semantically, this behaves the same as an regular window with gdk_window_set_child_input_shapes() called on it (and re-called any time a child is changed), but its far more efficient and easy to use. This allows us to fix the testoverlay input stacking test. https://bugzilla.gnome.org/show_bug.cgi?id=750568 https://bugs.freedesktop.org/show_bug.cgi?id=90917
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