GitLab

Collapse block margins between sibling spanners and add inline margins,
including auto margins.

We now position spanners correctly.

Bug: 829028
Change-Id: I07b5c1af92852d385cf558db6c20de61e88d87d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1860419
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706114}