Selector: Make selectors with leading combinators use qSA again #4509
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An optimization added in jquery/sizzle#431 skips the temporary IDs for selectors not using child or descendant combinators. For sibling combinators, though, this pushes a selector with a leading combinator to qSA directly which crashes and falls back to a slower Sizzle route. This commit makes selectors with leading combinators not skip the selector rewriting. Note that after jquery#4454 & jquery/sizzle#453, all modern browsers other than Edge leverage the :scope pseudo-class, avoiding temporary id attributes. Ref jquery/sizzle#431
timmywil
approved these changes
Oct 14, 2019
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Summary
An optimization added in jquery/sizzle#431 skips the temporary IDs for selectors
not using child or descendant combinators. For sibling combinators, though, this
pushes a selector with a leading combinator to qSA directly which crashes and
falls back to a slower Sizzle route.
This commit makes selectors with leading combinators not skip the selector
rewriting. Note that after #4454 & jquery/sizzle#453, all modern
browsers other than Edge leverage the :scope pseudo-class, avoiding temporary
id attributes.
Ref gh-431
+3 bytes
Sizzle PR (for jQuery 3.x): jquery/sizzle#460
Checklist
[ ] New tests have been added to show the fix or feature works(we don't generally if a selector goes throughqSA)If needed, a docs issue/PR was created at https://github.com/jquery/api.jquery.com