LibWeb: Preserve definite block size in intrinsic sizing - #11152
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Carry a flex item’s definite block size into intrinsic inline-size measurements. This allows percentage-height descendants with a preferred aspect ratio to contribute their transferred width instead of collapsing the flex item to zero. Key intrinsic measurements by the assigned block size and add coverage for a stretched flex item containing an aspect-ratio box.
📝 WalkthroughWalkthroughThe intrinsic-size cache key now includes the measured block size. Intrinsic inline sizing accepts optional definite block-size constraints and preserves them in measurement roots and cache lookups. Flex items use definite-block-size-specific min-content and max-content calculations when available. A new flexbox text test verifies 400-pixel widths for an item and its aspect-ratio child. Possibly related PRs
Suggested reviewers: Merge Risk: 🔵 Low · up to Definite block-size measurements may repeat intrinsic layout work instead of reusing cached results. The PR remains mergeable with owner awareness and a follow-up to restore cache reuse; no merge-blocking correctness risk is identified. 🚥 Pre-merge checks | ✅ 3✅ Passed checks (3 passed)
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Inline comments:
In `@Libraries/LibWeb/Rust/src/layout/sizing_context.rs`:
- Around line 1325-1329: Update measure_intrinsic_inline_size’s intrinsic
measurement cache lookup to try the key containing Some(block_size) when
available_block_size is definite, while retaining the existing None key lookup
as a fallback for legacy entries.
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📒 Files selected for processing (6)
Libraries/LibWeb/Rust/src/layout/flex_formatting_context.rsLibraries/LibWeb/Rust/src/layout/formatting_context.rsLibraries/LibWeb/Rust/src/layout/layout_node_arena.rsLibraries/LibWeb/Rust/src/layout/sizing_context.rsTests/LibWeb/Text/expected/flex-item-intrinsic-width-from-aspect-ratio-child.txtTests/LibWeb/Text/input/flex-item-intrinsic-width-from-aspect-ratio-child.html
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Carry a flex item’s definite block size into intrinsic inline-size measurements. This allows percentage-height descendants with a preferred aspect ratio to contribute their transferred width instead of collapsing the flex item to zero.
Key intrinsic measurements by the assigned block size and add coverage for a stretched flex item containing an aspect-ratio box.