Re-export source loader:Story 1

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BaselineBuild 14182 on pull/9505
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The baseline is shorter than the new snapshot (1200x18 to 1200x50).
Baseline History
Build 14246c35919c
Current build. There are unaccepted changes, so build 14182 is still the baseline.
Build 14182018b6d2 current baseline
Accepted by Michael Shilman.
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