Win groups the windows of the same program. When I close the whole group of the gimp windows, I get a confirmation to close the layers panel for example. If the layers panel is visible, I see the confirmation and it is ok, but if it is minimized, I cannot restore it because it waits for me to click on the confirmation and I cannot confirm the closing, because I cannot restore it. So the whole gimp closing freezes and I have to do the old good alt-ctrl-del thing.