When I use the Ambiance theme on my Ubuntu 15.10 (wily) in gnome-flashback I can resize the nautilus window only on the upper side (the area to resize the window is very thin). If I use an other theme like Adwaita resizing is possible on all four sides! I only have this problem with nautilus, all other Applications are fine!
Maybe an border is to thin to hit it on an HD Screen (1920x1800px)?!
In Adwaita the Cursor switches to "resize" on all four sides!
How can I resize the Nautilus window in the Ambiance Theme?