Account for spacing around mo in WPT test width-height-001.html
For mo elements, the preferred width of a shrink wrapper around the
operator includes the spacing around it.
This change introduces a special case for mo to account for this.
Bug: 370553386
Change-Id: Ie220443b57bb5ab63fd996acf9ec760a02ca612a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5924353
Reviewed-by: Ian Kilpatrick ikilpatrick@chromium.org
Commit-Queue: Ian Kilpatrick ikilpatrick@chromium.org
Reviewed-by: Frédéric Wang fwang@igalia.com
Cr-Commit-Position: refs/heads/main@{#1367094}