Ensure that GUI is correctly hidden and restored when toggling complete full screen
requested to merge stefanocrocco/konqueror:correctly-handle-gui-when-toggling-complete-fullscreen into master
Sometimes, toggling on and off complete fullscreen caused toolbars and the menu bar not to be restored correctly. Also, if the current tab contained more than one frame, turning on complete fullscreen should have left the current frame filling the whole space; instead the space was split between all the frames. These issue should now be fixed