Stylo: Update bindings for ServoType
This is needed for https://bugzilla.mozilla.org/show_bug.cgi?id=1348873
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stylo: Sequentialize binding generation if logging is enabled.
Otherwise the log is useless, and it's even slower than in parallel mode due to
the high lock contention.
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Addresses #15401
The desired result is for `CSSWideKeyword`s to return false (they are
parsed) and other Custom declaration values to return true (they are unparsed).
This whole method was a large `if let` block:
```rust
if let Some(mut root_flow) = self.root_flow.clone() {
// ...
}
```
Move that `if let` to callers to make it clear that the method
doesn’t need to be called when `self.root_flow` is `None`.
By itself, this commit doesn’t change anything.
But it enables the next one.
serialize font: to empty on non-default subprops
Fixes font shorthand serialization so that it serializes to "" when non-default subproperties are defined. These subproperties are those defined in #15033.
Adds tests:
- font_should_serialize_to_empty_if_there_are_nondefault_subproperties
- font_should_serialize_all_available_properties
The second test was previously commented out and underwent some cleanup to make it run.
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Fixes font shorthand serialization so that it serializes to "" when
certain subproperties of the font shorthand are set to non-default
values. These subproperties are:
- font-size-adjust
- font-kerning
- font-variant-caps
- font-variant-position
- font-language-override
Additionally, enable the above subproperties in the tests.
Stylo: Add support for -moz-* pseudo-classes for alt text
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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix [Bug 1341642](https://bugzilla.mozilla.org/show_bug.cgi?id=1341642)
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- [X] These changes do not require tests because they are stylo changes.
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