Rewind (left arrow) while playing has no effect in fast passage

MuseScore 0.9.6.3 and trunk

1. Open this score containing a lot of 32nd notes
2. Play the score
3. Try to rewind with the left arrow key

Expected result : You should be able to rewind.
Actual result : It's not possible to rewind.

Discussion : MuseScore does not stop the music when you rewind while playing. In a fast passage, rewind go slower than playing and so it looks like if rewind has no effect.

Workaround : use Ctrl + left arrow.

First reported by chen lung