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The main motivation behind this change is to get the code out of the way
when interrupted by spanners. In such cases there may be space left in
the fragmentainer when finishing the fragment before the spanner (i.e.
the last piece of column content before the spanner), but this should
neither be part of the fragment nor consumed block-size.

We used to include the remaining space of the column interrupted by a
spanner in consumed block-size, so that a node with fixed block-size
would have this subtracted when generating fragments after the spanner
(causing us to use less space on the node than we should).

Bug: 829028
Change-Id: I7990532474b45ef20900455da75b8337d08c62fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532467Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Alison Maher <almaher@microsoft.com>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826889}