tests, visual: add center marker to image_fill_modes.v
#187
| Job | Run time |
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| 4m 15s | |
| 40s | |
| 6m 32s | |
| 6m 13s | |
| 4m 33s | |
| 4m 42s | |
| 5m 20s | |
| 5m 20s | |
| 5m 16s | |
| 7m 4s | |
| 7m 47s | |
| 7m 26s | |
| 5m 41s | |
| 5m 18s | |
| 4m 23s | |
| 1h 20m 30s |