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Make Restyle tracking more granular.
The primary idea of this patch is to ditch the rigid enum of Previous/Current styles, and replace it with a series of indicators for the various types of work that needs to be performed (expanding snapshots, rematching, recascading, and damage processing). This loses us a little bit of sanity checking (since the up-to-date-ness of our style is no longer baked into the type system), but gives us a lot more flexibility that we'll need going forward (especially when we separate matching from cascading). We also eliminate get_styling_mode in favor of a method on the traversal. This patch does a few other things as ridealongs: * Temporarily eliminates the handling for transfering ownership of styles to the frame. We'll need this again at some point, but for now it's causing too much complexity for a half-implemented feature. * Ditches TRestyleDamage, which is no longer necessary post-crate-merge, and is a constant source of compilation failures from either needing to be imported or being unnecessarily imported (which varies between gecko and servo). * Expands Snapshots for the traversal root, which was missing before. * Fixes up the skip_root stuff to avoid visiting the skipped root. * Unifies parallel traversal and avoids spawning for a single work item. * Adds an explicit pre_traverse step do any pre-processing and determine whether we need to traverse at all. MozReview-Commit-ID: IKhLAkAigXE
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@ -97,7 +97,6 @@ use std::sync::Arc;
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use std::sync::atomic::{AtomicUsize, Ordering};
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use style::attr::{AttrValue, LengthOrPercentageOrAuto};
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use style::context::ReflowGoal;
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use style::dom::TRestyleDamage;
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use style::element_state::*;
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use style::matching::{common_style_affecting_attributes, rare_style_affecting_attributes};
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use style::parser::ParserContextExtraData;
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