Window.mergeChildInputShapes

Merges the input shape masks for any child windows into the input shape mask for window. i.e. the union of all input masks for window and its children will become the new input mask for window. See [gdk.window.Window.inputShapeCombineRegion].

This function is distinct from [gdk.window.Window.setChildInputShapes] because it includes window’s input shape mask in the set of shapes to be merged.