Martin Robinson 042d95220a layout: Replace dirty root approach with flexible box tree layout (#42700) ...

Replace the old dirty root box tree layout approach with one that works
based on independent formatting contexts. Instead of just allowing a
single dirty root to be the source of box tree reconstruction, allow box
tree reconstruction to happen anywhere in the tree that can isolate box
tree damage from ancestors. This essentially combines damage propagation
and box tree construction into a single step.

There is currently one downside to this approach compared to the dirty
root approach which is that we currently cannot detect and start box
tree layout when the dirty has a compatible `display` and `position`
value. This can mean the scope of box tree layout extends further up the
tree. We will address this in a followup -- but have not noticed any
major performance implications (currently fragment tree layout is much
more expensive than box tree layout).

Benefits:
 1. Damage propagation now only happens under the dirty root.
 2. Future changes can limit the scope of damage up the tree and perhaps
    preserve the inline content size cache between box tree rebuilds.

Testing: This should not change behavior in a testable way (we currently
do
not have robust performance tests), so WPT test results should not
change.

---------

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Oriol Brufau <obrufau@igalia.com>
Co-authored-by: Luke Warlow <lwarlow@igalia.com>

2026-02-19 14:31:13 +00:00

..

document.rs

cargo: Bump rustc to 1.89 (#36818)

2025-08-19 11:07:53 +00:00

element.rs

layout: Replace dirty root approach with flexible box tree layout (#42700)

2026-02-19 14:31:13 +00:00

mod.rs

Replace some #[allow] with #[expect] (#40865)

2025-11-24 22:41:45 +00:00

node.rs

layout: Handle selection during display list construction (#41963)

2026-01-21 08:04:15 +00:00

shadow_root.rs

Upgrade Stylo to 2026-02-02 (#42361)

2026-02-09 11:16:42 +00:00