nick_m 5c2ccc4f3e Allow negative return in TempoMap::beat_at_frame() and its exact_ variant. ...

- audio-locked midi regions can be start-trimmed properly
	  when close to 1|1|0
	- a midi region placed before the first meter
	  will continue the tempo curve and first meter.

Only a couple of callers require change, as bbt_at_beat() already
deals with this.

2016-08-14 03:04:53 +10:00

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