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.
Per-process lock for CSSOM objects
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Before this PR, every object reflected in CSSOM is in `Arc<RwLock<_>>` to enable safe (synchronized) mutable aliasing. Acquiring all these locks has significant cost during selector matching:
* https://bugzilla.mozilla.org/show_bug.cgi?id=1311469
* https://bugzilla.mozilla.org/show_bug.cgi?id=1335941
* https://bugzilla.mozilla.org/show_bug.cgi?id=1339703
This PR introduce a mechanism to protect many objects with the same `RwLock` that only needs to be acquired once.
In Stylo, there is one such lock per process (in a `lazy_static`), used for everything.
I non-Stylo Servo, I originally intended to have one such lock per document (for author-origin stylesheets, and one per process for user-agent and user sytlesheets since they’re shared across documents, and never mutated anyway). However I failed to have the same document-specific (or pipeline-specific) `Arc` reachable from both `Document` nodes and `LayoutThread`. Recursively following callers lead me to include this `Arc` in `UnprivilegedPipelineContent`, but that needs to be serializable. So there is a second process-wide lock.
This was previously #15998, closed accidentally.
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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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Remove never-sent ReflowWithNewlyLoadedWebFont message, fix#16026
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Adds tests:
- font_should_serialize_to_empty_if_there_are_nondefault_subproperties
Tests that the font subproperty serializes to an empty string when
certain non-default subproperties are defined.
- font_should_serialize_all_available_properties
Verifies that all properties that the font shorthand can display
will be serialized. This test was previously commented out and has
been simplified.
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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Box more specified values to bring SpecifiedValue/PropertyDeclaration sizes down to 24/32 bytes
I think these properties are generally rare enough that they're not worth adding 8 bytes of memmove overhead on every PropertyDeclaration. There are a _lot_ of 24-byte properties though, so I think that's probably a good sustainable level.
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Implement dissimilar-origin window.parent and window.top
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This PR implements `window.parent` and `window.top` for dissimilar-origin windows.
This PR builds on #15536, only the last commit is part of this PR.
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Upgrade dependencies with minor updates
Closes#16008
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stylo: Update clip-path and transform-box glue.
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Gecko bug1340044 should be land immediately after this PR been merged.
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