Added Async HTML Tokenizer
Design: I realized having two different parsers for sync and async was wrong, because the API for both was fundamentally the same. All I needed to do was create another Tokenizer, because `ParseNode` ( representation for nodes which are yet to be created) is used by the TreeBuilder and the Sink, and the `Tokenizer` is the 'lowermost' type concerned with these two types.
Therefore, I created one and placed it in `async_html.rs`, and also created a new Sink which deals with `ParseNode`s. I changed the methods in ServoParser to take an `async` argument too, which decides which Tokenizer will be used. The Tokenizer isn't exactly *async* for now, but this PR separates action creation from execution, which allows the async behaviour to be implemented later. Right now, all actions are executed soon after they are created.
The Sink consists of two Hashmaps, `nodes`, which contains the actual nodes, with the key being their corresponding `ParseNode`'s id, and `parse_node_data`, which contains metadata about the nodes.
It's still a bit rough, (I can't figure out how to deal with `complete_script` and `is_mathml_annotation_xml_integration_point`, along with some other parts I wrote in a hurry), but I believe the overall design is sound. I'd like to hear what you think about it.
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Fix over-alignment assert crash on Android.
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See https://github.com/servo/servo/issues/17320
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Hold stderr lock when using stdout through Console APIs.
This addresses a longstanding source of intermittent test failures where the stderr and stdout outputs get interleaved and the test harness becomes confused.
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Propagate changes in custom properties' computed values to descendants
If ComputedValues.custom_properties differs between the old and new
ComputedValues, indicate that we have to propogate changes to
descendants by setting child_cascade_requirement to
MustCascadeDescendants in cascade_primary.
style::matching::TElement::cascade_primary already calls
accumulate_damage, which eventually calls
ServoRestyleDamage::compute_style_difference in order to check if other
properties' computed values changed. If any of those change, we signal
that we need to propogate changes for inherited properties.
With Properties & Values, some custom properties will not be inherited,
and we will need to revisit this.
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WebIDL HTMLConstructor support
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spec: https://html.spec.whatwg.org/multipage/#htmlconstructor
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Fix setting img src before window.onload causing panic
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Setting an image source asynchronously (e.g. using `setTimeout` or in the callback of an `XMLHttpRequest`) before `window.onload` fired would cause a panic due to a preexisting load blocker not being terminated before assigning a new one.
This PR fixes that and adds a test for it.
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windows: fix line height handling
hi there!
on windows, this change properly scales a font's line height by its size.
previously, line height was not scaled to the font's size at all, which meant line heights become worse and worse the further you scaled away from the font's design size (in either direction, larger or smaller).
this change makes the `line_gap` ratio and size scale with the font size. i've hand checked that the new computed `line_gap` matches the effective heights in chrome and firefox when `line-height = normal` for a bunch of system fonts. (servo's rendering quality on windows is a different story, though).
i believe this also solves #16476.
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Avoid panic when reloading a page with mouse event handlers
This PR fixes issue #16057, by nullifying `topmost_mouse_over_target` inside of the `handle_exit_pipeline_msg` method, in case owner document is the same as the pipeline document that is being destroyed.
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Testing was done manually, by running `./mach run (-r|-d) "http://localhost:8000/minimal.html" `, where `minimal.html` contains `<div onmouseover="location.reload()" onmouseout="this.clientLeft">hi there</div>`.
r?@jdm
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