Andreas Kling 35839af2d2 LibWeb: Optimize getComputedStyle() to avoid layout when possible ...

Previously, getComputedStyle() would always call update_layout() for
most properties. This was expensive since layout involves a full tree
traversal even when only style information is needed.

This change introduces a more granular approach:
- Properties needing layout computation (used values like width/height)
  still call update_layout()
- Properties needing a layout node for resolved value computation
  (colors, border widths, etc.) also call update_layout()
- All other properties now only call update_style()

The set of properties needing layout node for resolution is now defined
in Properties.json via the "needs-layout-node-for-resolved-value" flag,
rather than being hardcoded. This is generated into a new function
property_needs_layout_node_for_resolved_value().

2026-01-26 12:40:36 +01:00

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