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