When display style is changed from 'none' to other in animation-only restyle
we need to resolve descendant elements' style that were in the display:none
subtree.
Three possible ways to resolve the descendant elements' style;
1) Traversing unstyled elements in animation-only restyle
We can't simply traverse unstyled elements in the animation-only restyle
since when we decided to traverse the unstyled elements we don't know yet
the elements will be initially styled or are in display:none subtree. It
will result that the new elements are styled in animation-only restyle,
it's undesirable.
2) Creating a SequentialTask and resolve the descendants' style with
ServoStyleSet::StyleNewSubtree()
We can't resolve the descendants' styles with ServoStyleSet::StyleNewSubtree()
in SequentialTask since at the moment we are still in servo traversal (i.e.
sInServoTraversal is true). That means AutoSetInServoTraversal fails
in PrepareAndTraverseSubtree().
3) Creating a SequentialTask and set restyle subtree hint and defer descendants'
restyle in a subsequent normal traversal
Note that, when we process throttled animations flush, we don't process
normal traversal so the descendants will not be traversed until normal
restyle happens but it will not be a big problem since it's really rare
that user clicks display animation element just at the right moment when
display property changes from none to other. Also, if it will be really
a problem, we should process *only* transform animations on the compositor,
it's ideally right thing to do. Display property never runs on the
compositor.
This patch takes the third approach.
Update the "Running the tests manually" section of the README for tests/wpt.
The previous instructions did not work because of how
`resources/testharnessreport.js` is actually a template. Update the instructions
to provide instructions for replacing that file.
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- [ ] These changes fix #__ (github issue number if applicable).
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Make grid-template-areas/columns/rows animatable
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The previous instructions did not work because of how
resources/testharnessreport.js is actually a template. Update the instructions
to provide instructions for replacing that file.
Don't start kicking off work units during parallel stylo traversal until they're actually full
This improves style sharing at the cost of a bit less parallelism. Fixes Gecko
bug 1385982. r=bholley
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stylo: Report a specific error for invalid CSS color values
Reviewed by heycam in https://bugzilla.mozilla.org/show_bug.cgi?id=1381143.
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Script paint worklets speculative evaluation
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This PR speculatively calls paint worklets during style, which increases the concurrency, since it increases the chance that the cache will have the right result in it when it comes to layout. The speculation is wasted effort if the size of the element has changed, but this is often not the case.
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- [X] These changes fix#17486 and #17369.
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geckolib: Add friendly panic message to Servo_HasAuthorSpecifiedRules.
This just adds a friendlier panic message when `Servo_HasAuthorSpecifiedRules` is called with an unstyled element.
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