gnome2-wnck-0.15 has been out for a couple of months and is needed for other libraries, ex. =libwnck-2.20.*. Reproducible: Always Steps to Reproduce: the old ebuild works, and there is no need for the window_close_patch.
Created attachment 142625 [details] ebuild for gnome2-wnck-0.15
Created attachment 142626 [details] ebuild for gnome2-wnck-0.15
gnome2-wnck-0.16 is in the tree