layout: Fix depends_on_block_constraints logic (#38318)

The logic was wrong, sometimes we weren't setting it to true on flex
containers that needed it, and then as a workaround we were setting it
to to true on flex items that didn't need it.

For example, this testcase had 5 cache misses when stretching the items,
now we will avoid laying them out again:
```html
<div style="display: flex">
  <div></div>  <div></div>  <div></div>  <div></div>  <div></div>
</div>
```

Also, the workaround wasn't always working, e.g. it failed to stretch
the green element here:
```html
<div style="display: flex; min-height: 200px">
  <div>
    <div style="display: flex; height: 100%; background-color: red">
      <div style="width: 200px; background-color: green;"></div>
    </div>
  </div>
</div>
```

Testing: Adding new test
Fixes: #38023

Signed-off-by: Oriol Brufau <obrufau@igalia.com>
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Oriol Brufau 2025-07-29 11:59:54 +02:00 committed by GitHub
parent a5d4c49ec6
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10 changed files with 50 additions and 36 deletions

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@ -205,7 +205,6 @@ impl taffy::LayoutPartialTree for TaffyContainerContext<'_> {
&content_box_size_override,
containing_block,
preferred_aspect_ratio,
false, /* depends_on_block_constraints */
&lazy_block_size,
);