When a free client enters and then leaves the fullscreen mode, original size of the window don't get restored, though the original position do. This issue appears with the windows that don't bother to remember its original size themself. According to this http://standards.freedesktop.org/wm-spec/1.3/ar01s05.html
_NET_WM_STATE_FULLSCREEN indicates that the window should fill the entire screen
and have no window decorations. Additionally the Window Manager is responsible for restoring
the original geometry after a switch from fullscreen back to normal window.
When a free client enters and then leaves the fullscreen mode, original size of the window don't get restored, though the original position do. This issue appears with the windows that don't bother to remember its original size themself. According to this http://standards.freedesktop.org/wm-spec/1.3/ar01s05.html