Comment 54 for bug 160311

It is not true that Mac OS lets you change window border thickness: since 2001 its windows have had no resize border at all. Instead, resizable windows always have a resize grippy in the lower right corner.

Apple does provide an example, however, of another of the solutions proposed in previous comments: an invisible drag area. In iTunes 7.0 the border between the source list and the rest of the window was a 1-pixel-wide draggable splitter. In iTunes 7.3 an invisible 6-pixel-wide draggable area was added around the 1-pixel border. <http://thinkmac.co.uk/blog/2007/07/itunes-73-ushers-in-welcome-ui-changes.html> But apparently that still wasn't enough, and in 7.4 a grippy at the bottom was added as well. <http://inessential.com/?comments=1&postid=3100>

I have no insight on whether an invisible draggable area would be both sufficient and error-free enough to work well for resizing windows. User-test it and see. :-) Meanwhile, report bugs that GTK should provide a corner resize grippy that doesn't require a status bar, and that more apps should use corner resize grippies.