With the version currently in Gentoo's portage, tagged as final 0.17, I've got the following bug:
Pressing C-A+f to put a window into fullscreen mode and then doing it again to revert it, does not update the window contentsto fit again.
Best example I could find is the keybindings dialog. Open it in it's default size, hit the mentioned key-combo twice and the complete right part of the window is no longer shown until manually calling the resize function(ie. resizing by 1px is enough).