commit 2dbeeb6cfcea8989c995a82b430a3b9f2984d0ce
author Alison Maher <almaher@microsoft.com> Thu Mar 17 22:00:14 2022
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> Thu Mar 17 22:00:14 2022
tree 2b1e2202a705821a4f4d7c6299b8faed1714741a
parent f103d8fd016ca4c8d7383529f0137b4616487906

[FlexNG] Handle break rules for multi-line columns

Add support for break-before/after/inside rules for multi-line column
flex containers. Because we fragment the columns independently, we
needed a way to keep track of the break-after and early-break for each
column (tracked by NGFlexColumnBreakInfo).

We also may now have more than one early break in a given fragment, so
a way to pass in additional early breaks was added to the layout
algorithm when we abort due to an early break.

Because columns can be considered a "row" of columns, the break-before
for all first items in a column were accumulated to the container
(same with break-after and the last items in each column).

Bug: 660611
Change-Id: I198fe0543f2c89bb5d188a4e2996bec89b4546cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3531137
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Alison Maher <almaher@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#982441}