image/tree: Fix table header having escape codes when not tty #8328
| Job | Run time |
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| 7s | |
| 7s | |
| 0s | |
| 1m 19s | |
| 1m 12s | |
| 1m 22s | |
| 1m 16s | |
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| 1m 13s | |
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| 1m 15s | |
| 1m 23s | |
| 1m 18s | |
| 1m 11s | |
| 1m 18s | |
| 1m 9s | |
| 1m 21s | |
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| 1m 15s | |
| 1m 24s | |
| 1m 13s | |
| 1m 21s | |
| 1m 29s | |
| 1m 18s | |
| 1m 18s | |
| 1m 13s | |
| 1m 21s | |
| 1m 12s | |
| 1m 16s | |
| 1m 11s | |
| 1m 26s | |
| 1m 14s | |
| 1m 16s | |
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| 1m 20s | |
| 1m 12s | |
| 1m 10s | |
| 59s | |
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| 59s | |
| 1m 20s | |
| 57s | |
| 1m 14s | |
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| 1m 7s | |
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| 1h 7m 3s |