layout: Do not use orthogonal baselines in flex layout
When a baseline is orthogonal to the main flexbox axis, it should not
take part in baseline alignment. This change does that for column flex.
While there is no support for vertical writing modes, this change is
made to be as writing mode-agnostic as possible.
Signed-off-by: Martin Robinson mrobinson@igalia.com
Co-authored-by: Oriol Brufau obrufau@igalia.com