Support currentColor for fill and stroke.
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This is a PR for https://bugzilla.mozilla.org/show_bug.cgi?id=1368376
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style: Support a restyle hint that indicates all descendants must be recascaded.
This also moves the result of deciding whether to recascade from the RestyleData into the RestyleHint.
Reviewed in https://bugzilla.mozilla.org/show_bug.cgi?id=1367647.
This makes the code cleaner, and also documents the fact that effective_rules
recurses into imports.
No we're not adding the imported stylesheets twice, and we share code with the
invalidation analysis.
MozReview-Commit-ID: DOF2AViTlmR
Apparently my whole conception of how the list of sheets in the styleset looked
like was flawled, and we only ever get one append_sheet for the topmost
stylesheet, instead of one for each.
MozReview-Commit-ID: FMClygMJkTc
Using stack-allocated variable for font feature setting
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Using stack-allocated small vector instead of the previous vector<u8>.
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upload geckolib docs to doc.servo.org
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add `geckolib` docs into upload docs script
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remove no-op viewport code
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