Fix flattening tracks sometimes splits contiguous clips into segments issue #2454
| Job | Run time |
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| 1m 55s | |
| 1m 42s | |
| 1m 44s | |
| 3m 4s | |
| 1m 56s | |
| 3m 18s | |
| 1m 53s | |
| 1m 30s | |
| 1m 43s | |
| 1m 43s | |
| 1m 43s | |
| 1m 41s | |
| 1m 41s | |
| 1m 42s | |
| 1m 42s | |
| 1m 58s | |
| 1m 58s | |
| 1m 55s | |
| 1m 58s | |
| 1m 57s | |
| 1m 56s | |
| 1m 55s | |
| 1m 40s | |
| 1m 50s | |
| 1m 53s | |
| 1m 40s | |
| 0s | |
| 0s | |
| 49m 37s |