Make undo/redo work for:
authornick_m <mainsbridge@gmail.com>
Fri, 6 Feb 2015 10:54:27 +0000 (21:54 +1100)
committernick_m <mainsbridge@gmail.com>
Fri, 6 Feb 2015 10:54:27 +0000 (21:54 +1100)
undo (n) where n > 1
redo (m) where m < n
new transaction.

Previously the redo list was left untouched.
This would lead to utter nonsense in the redo list.

AFAICT this never worked.


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