[xmonad] Issue 129 in xmonad: ClassLayout.description type signature is wrong

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Issue 129: ClassLayout.description type signature is wrong
http://code.google.com/p/xmonad/issues/detail?id=129

New issue report by andrea.rossato:
The type signature of ClassLayout.description, presently layout a ->
String, makes layout composition at the class level impossible.

There are cases where the Layout choice must be done within the X 
monad. In
this cases the composition of layout descriptions will loose all the choice
information.

Since the description method is presently used to match a given layout,
composition at the class level breaks the current design.

There are 2 solution:

1. change the type signature of description to layout a -> X String
2. using something else to match layouts.

The second one seems the worse in terms of coding effort.


Issue attributes:
	Status: New
	Owner: ----
	Labels: Type-Defect Priority-Medium

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