[xmonad] Re: Issue 304 in xmonad: CycleWS should actually track workspace history rather than depending on order of hidden workspaces

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Updates:
	Summary: CycleWS should actually track workspace history rather than  
depending on order of hidden workspaces
	Status: Accepted
	Labels: Type-Enhancement Component-Contrib

Comment #2 on issue 304 by byorgey: CycleWS should actually track workspace  
history rather than depending on order of hidden workspaces
http://code.google.com/p/xmonad/issues/detail?id=304

The problem is that toggleWS simply assumes that the "previous workspace"  
is the one
at the head of xmonad's internal list of hidden workspaces.  But there are  
various
operations other than switching away from a workspace which will also place  
it at the
head of this list.  There is nothing special about scratchpads here; if you  
shift any
window on the current workspace to another workspace, that other workspace  
will now
be the "previous workspace" as far as toggleWS is concerned.

The real problem is that the order of workspaces in xmonad's list of hidden
workspaces is not really supposed to mean anything, so toggleWS is  
depending on
undefined behavior. The only way to really fix this would be to have  
CycleWS track
the workspace history itself.

Here's a sketch of a possible solution: CycleWS could use the new  
extensible state to
track the workspace history, and provide something to put in the logHook  
that would
notify CycleWS every time the current workspace changes. (It would be nicer  
if
putting something in the logHook was not necessary, but otherwise it is not  
clear how
CycleWS would find out about workspace changes.)

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