Sets the input shape mask of @window to the union of input shape masks
for all children of @window, ignoring the input shape mask of @window
itself. Contrast with gdk_window_merge_child_input_shapes() which includes
the input shape mask of @window in the masks to be merged.
Sets the input shape mask of @window to the union of input shape masks for all children of @window, ignoring the input shape mask of @window itself. Contrast with gdk_window_merge_child_input_shapes() which includes the input shape mask of @window in the masks to be merged.