Sat May 26 17:16:17 JST 2007 Rob
* Windows on multiple workspaces
Previously, it was a invariant that a window will never have duplicates
in the stackset.
This invariant has been removed and replaced with the invariant that a
window will never have duplicates in a stack. It may have duplicates
appear in other stacks. This makes it possible to have DWM style tagging.
Other than adjusting insertLeft and delete/deleteAll to allow for duplicates
in the stackset, support must be made for xinerama. The xinerama support is
designed as follows:
1. The current screen always has all windows showing. This ensures that focus
(only meaningful on the current screen) will not need to be changed
2. non-current visible screens have all windows showing which are not already
showing on windows to the screen's "left" (defined as screens with lower
ordered identifiers).
This functionality has been placed in a new visibleOnScreen function which
returns the windows visible on a screen given the above rules. The refresh and
hide functions in Operations have been adjusted to use this new function to
ensure windows are displayed sanely.
