It's unfortunate, but it's a correctness issue. I was looking at the
expectations update here:
* https://hg.mozilla.org/integration/autoland/rev/659cddddd434
And investigating it I realised that it's wrong to coalesce selectors like that,
because we keep the bloom filter flags.
So in the test cases disabled, we have a selector that looks like this:
msub > :not(:first-child),
msup > :not(:first-child),
msubsup > :not(:first-child),
mmultiscripts > :not(:first-child) {
-moz-script-level: +1;
-moz-math-display: inline;
}
And an element that looks like this:
<msubsup><mi></mi><mi></mi></msubsup>
We're only inserting the first selector msub > :not(:first-child) into the set,
so when we're going to match the <mi> elements we fast-reject it in both cases
due to the bloom filter, so they share style.
I can't see an easy way to fix this keeping the deduplication. If we keep it, we
need to remove the bloom filter optimization, which means that we'd trash the
cache for every first-child in the document (the :not(:first-child) effectively
becomes a global rule).
MozReview-Commit-ID: 9VPkmdj9zDg
Signed-off-by: Emilio Cobos Álvarez <emilio@crisal.io>
These are never stored persistently anywhere, and I'm pretty sure it's slower
for the compiler/CPU to operate on non-word-sized flags.
MozReview-Commit-ID: LQNsJbUsw85
This significantly reduces realloc time at the expense of some additional
mmemmoves, but pencils out to a small win on my machine.
We wanted to do this anyway, and this avoids needing to remove the smallvec
dependency from Selectors and then add it back again.
MozReview-Commit-ID: HW4kDxzLACp
This improves cache locality and reduces allocations during parsing.
Note that this reverses the iteration order within a sequence of simple selectors,
but that shouldn't matter.
Make tidy check that opening and closing braces that begin a line do …
…so with proper alignment.
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Removing recursion from ComplexSelector
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Using a smallvec instead of recursively calling to_css for ComplexSelector to handle running out of stack.
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Also, simplify all the pre-snapshot attribute hacks in the script and style
code.
MozReview-Commit-ID: 6c9ipeb7Tnr
Signed-off-by: Emilio Cobos Álvarez <emilio@crisal.io>
