[Xmonad] darcs patch: change workspaces to [WorkspaceId]

[David Roundy]

This simplifies several lines of code (although it doesn't
eliminate any lines of code).  It eliminates the assumption
that the workspace IDs are contiguous, starting at zero, although
it doesn't change this property.

I hope this change goes in, as it improves the code, and
may also lead the way towards friendlier interaction with
a changing number of workspaces.

David

Mon Aug 13 17:37:22 PDT 2007  David Roundy <droundy at darcs.net>
  * change workspaces to [WorkspaceId]

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