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_mask().
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.
Since 2.10
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_mask(). 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. Since 2.10