gdk:window-merge-child-shapes (window)

window -- a gdk:window object

Merges the shape masks for any child windows into the shape mask for the window. I.e. the union of all masks for the window and its children will become the new mask for the window. See the gdk:window-shape-combine-region function.

This function is distinct from the gdk:window-set-child-shapes function because it includes window's shape mask in the set of shapes to be merged.