Fix rewinding would undo one too many events.
Fix rewinding would undo one too many events.

Fix from Matt Breindel.

litasa/Memory-Trace,deplinenoise/ig-memtrace,litasa/Memory-Trace,litasa/Memory-Trace,Nuclearfossil/ig-memtrace,litasa/Memory-Trace,Nuclearfossil/ig-memtrace,Nuclearfossil/ig-memtrace,deplinenoise/ig-memtrace,litasa/Memory-Trace,deplinenoise/ig-memtrace