Only allow border-image-outset to use non-negative numbers.
Restricts border-image-outline to only allow positive values.
Fixes#14295
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Implement parsing/serialization and/or gecko glue for some properties
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The PR covers implementation and/or gecko glue for these properties:
1. Implemented parsing/serialization and gecko glue for column-rule-width, column-rule-color and column-span longhand properties (column-span is not implemented in gecko yet but I wanted to complete column properties :) )
2. Implemented parsing/serialization and gecko glue for text-emphasis-color longhand and text-emphasis shorthand properties.
3. Implemented gecko glue for column-gap and order properties
I implemented column-rule-width and column-rule-color properties with `-moz-` prefixes, but I can remove them if it's not right.
I coudn't test them in full stylo build yet (LLVM messed up my current clang). But I'll test them soon.
r? @Manishearth or @emilio
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Some generic impls for Either<Length, T>
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We seem to be using `parse_non_negative` a lot for `LengthOrFoo` types, so it's better to have generic impls (now, and in the future) for such things (assuming that `Length` will always be in the first variant of `Either`).
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CSSOM: Make Stylesheet fields have their own synchronization
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r? @upsuper
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We only consider doing a GC currently if the root node has a zero refcount.
But that only happens if it has no children -- even weak children keep a
strong reference to their parent. So at the very least, we should do a
GC specifically when the RuleTree is going away. (We probably want to add
some other GC opportunities too at some point, otherwise it's easy to
never GC a RuleTree.)
Make document url mutable and implement location.replace()
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GC the rule tree only when the free list gets to a certain size.
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Use a heuristic similar to Gecko's to decide when to GC the rule tree.
r? @emilio
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Stylo - gecko glue code for font-size-adjust.
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Implement the gecko-side glue code for font-size-adjust.
This is a followup for #14125, which is originally filed in #13875.
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Prefer Either type for LengthOrNumber
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This adds `impl GeckoStyleCoordConvertible for Either<A, B>` and makes `LengthOrNumber` prefer `Either<A, B>`.
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r? @SimonSapin
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