PrepareWorkspace:Lookup Merge Base

Build 3873 on next
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BaselineBuild 2343 on next
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The baseline is wider than the new snapshot (457x64 to 442x64).
Baseline History
Build 387345e9a51
Current build. There are unaccepted changes, so build 2343 is still the baseline.
Build 139048a7553
Accepted by Gert Hengeveld.
Build 1322c836a89
Accepted by Gert Hengeveld.
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