stylo: Fix font-variant-alternates property
`font-variant-alternates` was just parsing values as keywords. But many of the alternates are actually functions instead of keywords. This fixes that.
r=emilio on bugzilla side.
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- [X] These changes fix [Bug 1356124](https://bugzilla.mozilla.org/show_bug.cgi?id=1356124)
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stylo: Implement font-language-override descriptor for @font-face rule
Generally we use computed values for `@font-face` rule descriptors but that descriptor is a bit different than the others in gecko side. It accepts strings instead of unsigned integer(which is computed value of this property). So we had to use SpecifiedValue for that in here.
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When stylo is not enabled in Gecko, the global state initialization
still creates the style thread pool, even when it's not going to be
used. This wastes address space and a little memory.
See https://bugzilla.mozilla.org/show_bug.cgi?id=1374824#c38 and
following comment.
Before this change, the `ComputedStyle` struct that is part of permanent style
data per element holds 2 `StrongRuleNode`s (unvisited and visited) and 2
`Arc<ComputedValues>` (unvisited and visited).
Both rule nodes and the visited values don't actually need to be here. This
patch moves these 3 to new temporary storage in `CascadeInputs` on
`CurrentElementInfo` during the match and cascade process. Rule nodes are
pushed down inside the `ComputedValues` for later access after the cascade.
(Visited values were already available there.)
The permanent style data per element now has just the `Arc<ComputedValues>` for
itself and eager pseudo-elements (plus the `RestyleHint`).
MozReview-Commit-ID: 3wq52ERMpdi
style: Be more strict when setting the root font size.
Before this commit, we assumed that if the element had no parent element, it was
the root of the document, which is plain false, since we can arrive there from,
let's say, getComputedStyle on a detached node.
Bug: 1374062
Reviewed-By: heycam
MozReview-Commit-ID: 65DxdzXgd0J
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Right now when calling getComputedStyle with an element from another document,
we return the style using the pres context of that document, not of the document
of the window getComputedStyle was called on, so this holds.
But it will stop holding if we ever change this, so assert it doesn't happen.
Bug: 1374062
Reviewed-By: Manishearth
MozReview-Commit-ID: 3g8yQWWdsen
Add an update_stylesheet method to StylesheetSet.
MozReview-Commit-ID: KlRkApYL8wk
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Provides a method for just-cloned sheets to be swapped in to stylesheet_sets without changing the order or triggering restyle.
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Stylo: Correct style match for element instances under a use-element …
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This patch is the last one of bug 265894.
It fixes two things:
1. Do not cross shadow tree boundary while matching rules.
2. Change display value to 'inline' while cloning a root symbol element instance.
Bugzilla link:
https://bugzilla.mozilla.org/show_bug.cgi?id=265894
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