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LibWeb: Use unsafe layout/paintable accessors where appropriate

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Add unsafe_layout_node(), unsafe_paintable(), and unsafe_paintable_box()
accessors that skip layout-staleness verification. These are for use in
contexts where accessing layout/paintable data is legitimate despite
layout not being up to date: tree construction, style recalculation,
painting, animation interpolation, DOM mutation, and invalidation
propagation.

Also add wrapper APIs on Node to centralize common patterns:
- set_needs_display() wraps if (unsafe_paintable()) ...set_needs_display
- set_needs_paint_only_properties_update() wraps similar
- set_needs_layout_update() wraps if (unsafe_layout_node()) ...

And add Document::layout_is_up_to_date() which checks whether layout
tree update flags are all clear.
This commit is contained in:
Andreas Kling
2026-02-26 11:57:29 +01:00
committed by Andreas Kling
parent b8b63ddc8f
commit a146225331
Notes: github-actions[bot] 2026-02-26 20:10:33 +00:00 
Author: https://github.com/awesomekling
Commit: https://github.com/LadybirdBrowser/ladybird/commit/a146225331e
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/8182
48 changed files with 396 additions and 225 deletions
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3
Libraries/LibWeb/HTML/HTMLInputElement.cpp
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@@ -211,8 +211,7 @@ void HTMLInputElement::set_checked(bool checked)
},
{});
if (auto* paintable = this->paintable())
paintable->set_needs_display();
set_needs_display();
}
void HTMLInputElement::set_checked_binding(bool checked)