Only re-use an anonymous block for continuations if it's contained by a block flow.

Only re-use an anonymous block for continuations if it's contained by a block flow.

Be more strict about what kind of anonymous blocks we allow to be re-used for
continuations. The deprecated flex box implementation would actually let items
of a flexbox form a continuation chain. Continuations should only exist in
block formatting contexts.

This was discovered while attempting to land
https://codereview.chromium.org/1997033002/ , which, it turns out, made some
invalid assumptions about objects being block flows.

BUG=302024
Committed: https://crrev.com/e0d355a173d0bae9c533fe49ef23258f263e9a8b
Cr-Commit-Position: refs/heads/master@{#395614}

[mstensho (USE GERRIT), 2016-05-24 13:45:18]

mstensho@opera.com changed reviewers:
+ eae@chromium.org, szager@chromium.org, wkorman@chromium.org

[eae, 2016-05-24 15:56:45]

ok, LGTM

[eae, 2016-05-24 16:04:40]

The CQ bit was checked by eae@chromium.org

[commit-bot: I haz the power, 2016-05-24 16:05:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2004363003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2004363003/1

[commit-bot: I haz the power, 2016-05-24 16:51:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-24 16:53:15]

Description was changed from

==========
Only re-use an anonymous block for continuations if it's contained by a block
flow.

Be more strict about what kind of anonymous blocks we allow to be re-used for
continuations. The deprecated flex box implementation would actually let items
of a flexbox form a continuation chain. Continuations should only exist in
block formatting contexts.

This was discovered while attempting to land
https://codereview.chromium.org/1997033002/ , which, it turns out, made some
invalid assumptions about objects being block flows.

BUG=302024
==========

to

==========
Only re-use an anonymous block for continuations if it's contained by a block
flow.

Be more strict about what kind of anonymous blocks we allow to be re-used for
continuations. The deprecated flex box implementation would actually let items
of a flexbox form a continuation chain. Continuations should only exist in
block formatting contexts.

This was discovered while attempting to land
https://codereview.chromium.org/1997033002/ , which, it turns out, made some
invalid assumptions about objects being block flows.

BUG=302024

Committed: https://crrev.com/e0d355a173d0bae9c533fe49ef23258f263e9a8b
Cr-Commit-Position: refs/heads/master@{#395614}
==========

[commit-bot: I haz the power, 2016-05-24 16:53:17]

Patchset 1 (id:??) landed as
https://crrev.com/e0d355a173d0bae9c533fe49ef23258f263e9a8b
Cr-Commit-Position: refs/heads/master@{#395614}