Auto merge of #11545 - emilio:reddit, r=pcwalton

script: Ensure we don't ignore reflows for queries that bail out due to the viewport size not yet present

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #11223

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This fixes #11223.

Note that this didn't happen in the root pipeline because we explicitly set the
window size in that case.

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