bug#9350: 23.3; [usability] File menu should contain "split window horizontally C-x 3"

[Eli Zaretskii]

> Date: Tue, 23 Aug 2011 15:54:59 +0200
> From: Arne Babenhauserheide <arne_bab@web.de>
> 
> Splitting windows horizontally becomes more and more important as the screen 
> sizes rise - and it is prevalent in todays programming environments. 
> 
> So I think that it would be important to add that entry to the menu - also 
> because a new user just asked me that, so this is no theoretical construct, 
> but an observation. 

Any reasons not to show that user how to create a new frame, instead
of dividing the existing frame in two?