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_input_shape_combine_region().
This function is distinct from gdk_window_set_child_input_shapes()
because it includes @window’s input shape mask in the set of
shapes to be merged.
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_input_shape_combine_region().
This function is distinct from gdk_window_set_child_input_shapes() because it includes @window’s input shape mask in the set of shapes to be merged.