[@scope] Add ancestor chain in CalculateSeenImplicitScopes We incorrectly added the "root" element over and over, once for each element in the inclusive ancestor chain. This caused us to miss implicit scopes seen by ancestors. Also add some unit tests for HasSeenImplicitScope. Bug: 1508904 Change-Id: I20c67b47ad6e466eb2460e6a5997fed752c77bae Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5096784 Commit-Queue: Anders Hartvoll Ruud <andruud@chromium.org> Reviewed-by: Rune Lillesveen <futhark@chromium.org> Cr-Commit-Position: refs/heads/main@{#1234416}
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