gh-145392: Fix _pyrepl completion to replace input stem instead of appending
#184287
| Job | Run time |
|---|---|
| 15s | |
| 4m 5s | |
| 31s | |
| 21m 16s | |
| 13m 29s | |
| 3m 27s | |
| 4m 12s | |
| 16m 31s | |
| 9s | |
| 9m 29s | |
| 2m 55s | |
| 2m 40s | |
| 2m 40s | |
| 3m 40s | |
| 2m 45s | |
| 2m 56s | |
| 5m 5s | |
| 2m 42s | |
| 0s | |
| 19m 30s | |
| 13m 6s | |
| 20m 30s | |
| 26m 31s | |
| 24m 47s | |
| 18m 25s | |
| 17m 47s | |
| 22m 5s | |
| 12m 14s | |
| 18m 10s | |
| 17m 27s | |
| 10m 30s | |
| 12m 49s | |
| 8m 58s | |
| 5m 43s | |
| 10m 25s | |
| 1m 45s | |
| 1m 59s | |
| 21m 5s | |
| 0s | |
| 4s | |
| 6h 22m 37s |