merge_pr_49800

layout: Fix intrinsic contributions of anonymous blocks

In order to compute the inline min-content and max-content contributions
of an anonymous block, we were finding its min-content and max-content
inline size with a SizeConstraint coming from the block size of the box.

However, anonymous blocks do not establish a containing block for their
contents, so this patch uses a SizeConstraint from the block size of the
containing block.

Signed-off-by: Oriol Brufau [email protected]