Update selectors to 0.10, with ToCss serialization.
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r? @emilio
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This was the underlying cause of the restyle_hints_state.html failure.
It was uncovered only when fixing the HAS_EDGE_CHILD_SELECTOR flags because this
was the series of events happening.
* <script> starts executing.
* All the restyle hint processing takes place.
* <script> ends executing, gets appended to the body (I think this is also a bug).
* <body> receives children_changed notification, with an Append mutation.
* <body> had the HAS_EDGE_CHILD_SELECTOR flag, so due to its bogus value, it
restyled the whole tree after <body>, fixing any mishandling of restyle
hints.
The style candidate cache had regressed a few times (see #12534), and my
intuition is that being able to disable all style sharing with a single rule in
the page is really unfortunate.
This commit redesigns the style sharing cache in order to be a optimistic cache,
but then reject candidates if they match different sibling-affecting selectors
in the page, for example.
So far the numbers have improved, but not so much as I'd wanted (~10%/20% of
non-incremental restyling time in general). The current implementation is really
dumb though (we recompute and re-match a lot of stuff), so we should be able to
optimise it quite a bit.
I have different ideas for improving it (that may or may not work), apart of the
low-hanging fruit like don't re-matching candidates all the time but I have to
measure the real impact.
Also, I need to verify it against try.
10933/shorthands
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This implements the serialization of nearly all of the css shorthand properties with the following exceptions:
1. font - this may be implemented correctly, but I am not 100% sure
2. border-radius - I do not know how to implement this, since I am not familiar with how the property works
3. background - this is implemented, but I think that the implementation might be a tiny bit off.
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- [X] These changes fix#10933 (github issue number if applicable). Also fixes issue #11448
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Fix restyling on viewport resize.
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Fixes https://github.com/servo/servo/issues/12835
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Fix a cached style cascade bug that only manifested in sequential mode
When copying cached styles, keep the `writing_mode` up to date.
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EDIT: The test is now working. I ran it with the first commit (the actual fix) reverted and it failed.
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Add a flag to dump the computed style values
I used this to trace #11818 to a style bug, rather than a layout bug.
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Support 'word-spacing' for geckolib
**These changes haven't been tested yet!**
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stylo: Stop restyling display: none elements, remove the has_changed hack that made us use ReconstructFrame unconditionally.
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r? @bholley
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