refactoring in pageview class

[habruening]

Hi Albert! 

Please open okular in fullscreen mode and ask your wife or girl friend
or your neighbour how to come out of this mode. 

I don't ask you to give up Ctrl+Chift+F. 

Kate has a button "close fullscreen". Firefox opens the toolbar and
window title when mouse cusor moves to the upper corner. Okular has not
even a menu in full screen mode. 

Am 2017-02-14 00:31, schrieb Albert Astals Cid:

> First two apps i tried to go out of fullscreen with Esc:
> * kate
> * firefox
> Neither go out of fullscreen with Esc.
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