E&S CVS Commit: Trellis - Simplify undo by not logging undo's while undoing. This makes

[pje at eby-sarna.com]

Author: pje
Date: Mon Nov 26 14:18:45 2007
New Revision: 2435

URL: http://svn.eby-sarna.com?rev=2435&view=rev
Log:
Simplify undo by not logging undo's while undoing.  This makes
it possible to write code that doesn't care if it's a "do" or
"undo", which should make data structures similar.  i.e., the
reverse of an 'add' can then be a 'remove' and vice versa,
without needing to have separate 'undo_add' and 'undo_remove'
operations that don't log undo information.

Modified:
    Trellis/peak/events/collections.py
    Trellis/peak/events/stm.py
    Trellis/test_trellis.py