tree ebfa8138c09052e451eb89974e0999df5d169ef6
parent 8fb16ebdecf451251578b8a2c1396a53d13f46f8
author Morten Stenshorne <mstensho@chromium.org> 1625155128 -0700
committer Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> 1625157818 -0700

Don't stretch columns to encompass content that won't fit there anyway.

If there as many forced breaks as there are column boundaries (within
used column-count), we're not going to be able to insert any soft breaks
(except in overflowing columns). Don't stretch the multicol container to
avoid soft breaks in overflowing columns. This is what both legacy Edge
and legacy Blink do, and, making the columns "unreasonably" tall just to
avoid breaks inside overflowing columns doesn't make a lot of sense.
Still make room for any unbreakable content in there, though. This is
what the new test is about. It was already working, but had no test
coverage.

This fixes one existing test. Also relabel the expectation for
nested-with-forced-breaks-in-eariler-rows.html (sic!), as it has nothing
to do with this, but rather offsetTop calculation in nested multicol (it
renders correctly apart from that).

Bug: 1131125
Change-Id: I715c8a96f4c3734cac032db6cb2c3fae1752b1e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2999866
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#897739}