commit 472297a091b35e91e270449e16e749822130e627
author Fredrik Söderquist <fs@opera.com> Thu Dec 01 09:58:33 2022
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> Thu Dec 01 09:58:33 2022
tree f4c1ca92951576116982b962175f84be4e5000ed
parent df084322f09ca909686c21a8578e7cbcf03b0c6a

Perform source selection when adding/remove an <img> to a <picture>

When an <img> is removed from a <picture> parent, or when it is added to
a <picture> parent, a source selection should take place, since these
count as "relevant mutations" [1].

For the "insert" case, only <source> elements were considered previously.
For the "remove" case no selection was trigger at all.

Change the "insert" case to call SelectSourceURL(), and add handling in
the "remove" case to do the same.

In HTMLImageElement::RemovedFrom(), also move the unregistration of
listeners from the <source>s to be symmetric with
HTMLImageElement::InsertedInto() - i.e always do it if there is/was a
<picture> parent.

[1] https://html.spec.whatwg.org/multipage/embedded-content.html#the-img-element:html-element-insertion-steps

Fixed: 1393688
Change-Id: I7dcab791c8bff71149ec449106f9e25519ff3706
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4064460
Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/main@{#1077940}