Handle display property change from 'none' only if there is restyle hint for SMIL
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https://bugzilla.mozilla.org/show_bug.cgi?id=1401801
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We only need to handle changes when the display property is changed from 'none'
when we have a restyle hint for SMIL. The only other case where we expect to
see changes to display property during an animation are from using the CSSOM.
However, when the display property is changed from 'none' by the CSSOM, during
the animation-only restyle we can skip all descendants since they will be
traversed in the subsequent normal traversal because at that time we flush
style sheets and traverse all elements in the document. So we don't need to
care about the descendants during animation-only restyle.
fix#18594: Unnecessarily allocating an error string
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r? @asajeffrey
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style: Make sure to not run any style invalidation in an unstyled children only traversal.
Bug: 1402472
Reviewed-by: bholley
MozReview-Commit-ID: IFPA7LJpvsZ
Remove unused 'untagged_unions' feature gate
CC #5286
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Remove sources of panic when laying out an iframe without a nested browsing context
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At the moment, layout panics if it discovers an iframe without a nested browsing context. Under normal circumstances, this is reasonable, but it requires very tight synchronization between script, layout, the constellation and the compositor. In particular, if a layout is in progress when an iframe's browsing context is discarded, this can trigger panic.
This PR fixes this in two ways:
1. Making the pipeline and browsing context ids optional in layout's representation of an iframe.
2. Shutting down layout before discarding a browsing context, rather than after.
This is belt and braces.
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Make tidy aware of Rust multiline strings
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This makes the internal tidy script properly ignore the contents of Rust multiline strings.
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As a result of tighter and more correct handling of character
literals, this now catches a few kinds of syntax involving lifetimes
that were previously missed, so those have been updated.
`AnimationValue` has its own path for conversion to computed values, so we need
to update `for_non_inherited_property` in the context to match the property
being converted.
I didn't notice any other generic conversions, so hopefully this is the only
missing path.
MozReview-Commit-ID: HskrpMctmYE
Remove unused feature gates
CC #5286.
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Using OnceCell<T> from Mitochondria
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- [x] These changes fix#13402 (github issue number if applicable).
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