layout: Never stretch indefinite intrinsic keywords other than auto (#34672)

Consider:
```html
<div style="position: relative; width: 50px; height: 50px; border: solid; margin: 5px">
  <div style="position: absolute; top: 0; bottom: 0; height: max-content">
    <canvas width="25" height="25" style="background: cyan; height: 100%"></canvas>
  </div>
</div>
```

In order to determine the inline min/max-content sizes, we need a
tentative block size as the input, which only takes extrinsic values
into account.

In this case `height: max-content` is intrinsic, so we were treating it
as `height: initial`, which would behave as a definite `height: stretch`.
Therefore, the canvas was able to resolve its percentage.

However, it seems weird to treat an explicitly intrinsic keyword in an
extrinsic way, and Blink doesn't do it. So now we treat the tentative
block size as indefinite, therefore the percentage behaves as auto.

This adds a new test, we were previously failing 6 subtests, now only 3.

Signed-off-by: Oriol Brufau <obrufau@igalia.com>

components/layout_2020/geom.rs

@@ -627,7 +627,7 @@ impl ToLogicalWithContainingBlock<LogicalRect<Au>> for PhysicalRect<Au> {
 
 /// The possible values accepted by the sizing properties.
 /// <https://drafts.csswg.org/css-sizing/#sizing-properties>
-#[derive(Clone, PartialEq)]
+#[derive(Clone, Debug, PartialEq)]
 pub(crate) enum Size<T> {
     /// Represents an `auto` value for the preferred and minimum size properties,
     /// or `none` for the maximum size properties.