michael ea5a0dfb72 Enhancement: Before/After lock-unlock (see issue 1017) ...

Lock: keep the Before view unchanged -
useful to evaluate the cumulative effect of multiple tools.
Additionally, comparison can be made to any state in the History

Unlock: the Before view will follow the After view 1 step behind,
showing image before the effect of the currently used tool

2011-09-26 22:45:00 -04:00

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