The buggy animation handling isn't a regression, since currently we pass
UnstyledChildrenOnly in those cases, which blocks the animation traversal
in Servo_TraverseSubtree.
In general I really wanted to handle these two paths together. But there's
enough broken with the NewChildren path that I wanted to scope the buginess
as tightly as possible. And I really need to separate the handling here from
StyleDocument() to make the restyle root stuff work.
MozReview-Commit-ID: 9F0mcQl7AAX
Doing anything else is non-sensical, since we're not guaranteed to reach all of
the bits from traversal Y when doing traversal X.
MozReview-Commit-ID: FQliRxBan70
After bug 1356141, the setup of animation-only dirty bit should have matched
to normal dirty bit's one (Though they don't match in post traversal due to
throttled animation flush). An unset_animation_only_dirty_descendants call
removed in this patch cleared dirty bits which are needed for post traversal if
there is a second animation-only traversal and if there is no need to restyle
for the second animation-only traversal.
The reftest in this patch fails without either this fix or the fix for bug
1367975.
See [Gecko bug 1384435 comment 12](https://bugzilla.mozilla.org/show_bug.cgi?id=1384435#c12)
for more detail what's going on at that time.
We already have a more-specific check further down in the file, which was added in the same revision.
I think this one was erroneous.
MozReview-Commit-ID: CnP0zCpBtnp
In animation-only restyle, we just need to check the element
has animation restyle hints or has recascade self which is a result
of animation-only restyle for ancestors.
has_current_styles() in Servo_ResolveStyle() is intentionally left there,
it will be changed in a subsequent patch.
In the next patch, we'll move logic to identify the children for traversal into
preprocess_children (which will be renamed), and the set_dirty_descendants logic
will move along with it. So left as-is, the code here will clobber the flags.
MozReview-Commit-ID: 7ZskKWD4QC3
This allows us to have ensure_data() and clear_data() functions on the TElement
trait, instead of hacking around it adding methods in random traits.
This also allows us to do some further cleanup, which I'd rather do in a
followup.
Before this change, the `ComputedStyle` struct that is part of permanent style
data per element holds 2 `StrongRuleNode`s (unvisited and visited) and 2
`Arc<ComputedValues>` (unvisited and visited).
Both rule nodes and the visited values don't actually need to be here. This
patch moves these 3 to new temporary storage in `CascadeInputs` on
`CurrentElementInfo` during the match and cascade process. Rule nodes are
pushed down inside the `ComputedValues` for later access after the cascade.
(Visited values were already available there.)
The permanent style data per element now has just the `Arc<ComputedValues>` for
itself and eager pseudo-elements (plus the `RestyleHint`).
MozReview-Commit-ID: 3wq52ERMpdi
Before this patch, we were setting the dirty descendants bit in animation-only
restyles and it triggered unnecessary traversal for elements that does not need
the traversal (i.e no need selector matching).
If we check it and skip the child after ensure_element_data() call,
the child will have an empty element data, so we will succeed
element_data.is_some() check unexpectedly.
This commit also removes the old restyle_hints module and splits it into
multiple modules under components/style/invalidation/element/.
The basic approach is to walk down the tree using compound selectors as needed,
in order to do as little selector-matching as possible.
Bug: 1368240
MozReview-Commit-ID: 2YO8fKFygZI
This patch renames TNode::parent_element to traversal_parent, since it returns
the parent from the perspective of traversal (which in Gecko uses the
flattened tree). It also renames TNode::children to traversal_children
for the saem reason.
We keep parent_element and children functions on TNode to use for selector
matching, which must be done on the real DOM tree structure.
