This morning I noticed that the new Cue code has some usability issues.
I set a cue point at the start of a drum sample and was trying to use 
the cue button to play with some break beats.

Description:
When I repeatedly press cue quickly to play the drum sample, sometimes 
it plays from the start of the cue, other times it starts further into 
the sample, cutting off the first drum beat. Repainting the whole 
waveform display occurs every time you release the cue button and if I 
wait for the waveform to completely redraw, it always starts the cue 
cleanly.

When rapid cueing like this, there also seems to be a good chance that 
the play position does not revert back to the cue point as the cue 
button is released. As a result, the next press of the cue button moves 
the cue point to wherever it was left.

To reproduce the behavior:
1) Set a cue point just before a drum beat
2) press the cue button rapidly (say 2-4Hz)

At first I thought the problem might be related to handling mouse 
double-clicks differently, but it also glitches under midi note control.


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