xfwm: support for 2d pagers

[Jasper Huijsmans]

Paramjit Oberoi wrote:
>>What's the reason for having prev/next besides left/right/up/down? In default
>>operation left/right will simply be the same as prev/next.
> 
> 
> Suppose you have a 2d pager with 2 rows & 4 cols:
> 
> +---+---+---+---+
> | 0 | 1 | 2 | 3 |
> +---+---+---+---+
> | 4 | 5 | 6 | 7 |
> +---+---+---+---+
> 
> Say the current workspace is 3.  Next always goes to workspace 4.  Move
> right either stays at 3 or goes to 0 depending on whether wrap_layout is
> disabled or enabled.
> 

Yeah, I know they're different, I just don't feel we should have both ;-)

> So, is there any benefit to next/prev?  I'm not sure.  They are only
> useful if you think of your workspaces as simultaneously being in a grid
> as well as being in a list.  It's probably possible to come up with
> cases where for half a day a grid makes sense, and for the other half a
> list makes sense, and you don't want to keep modifying your pager
> geometry constantly...
> 
> My opinion is that next/prev should be left as they are in the absence
> of strong opinions against them.
> 

To me they seem like two extra shortcuts for every move operation 
(workspace, windows to workspaces, more?) without obvious benefit. I 
agree it is a matter of opinion, I was just wondering if there were 
strong arguments to have both.

	Jasper