TEXTAREA element: Updating child nodes without updating textContent should do nothing

TEXTAREA element: Updating child nodes without updating textContent should do nothing

https://html.spec.whatwg.org/multipage/forms.html#the-textarea-element:textcontent
> When the textarea element's textContent IDL attribute changes value, if the
> element's dirty value flag is false, then the element's raw value must be set
> to the value of the element's textContent IDL attribute.

We should do nothing if textContent isn't changed. New behavior matches to Edge,
Safari, and the standard, and doesn't match to Firefox.

BUG=698647
Review-Url: https://codereview.chromium.org/2733783003
Cr-Commit-Position: refs/heads/master@{#454840}
Committed: https://chromium.googlesource.com/chromium/src/+/5cd3e773b0851d6e56bc2bcb46802c637c50b837

[tkent, 2017-03-06 07:33:21]

The CQ bit was checked by tkent@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-03-06 07:33:40]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[tkent, 2017-03-06 08:31:41]

tkent@chromium.org changed reviewers:
+ yoichio@chromium.org

[tkent, 2017-03-06 08:31:42]

yoichio@, would you review this please?

[yoichio, 2017-03-06 08:48:59]

lgtm

[commit-bot: I haz the power, 2017-03-06 09:14:22]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-03-06 09:14:23]

Dry run: This issue passed the CQ dry run.

[tkent, 2017-03-06 09:22:39]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2017-03-06 09:22:53]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-06 09:26:38]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1488792159721080, "parent_rev":
"34d645f1972fec67a0b54911e03bd27cb1ca8759", "commit_rev":
"5cd3e773b0851d6e56bc2bcb46802c637c50b837"}

[commit-bot: I haz the power, 2017-03-06 09:27:23]

Description was changed from

==========
TEXTAREA element: Updating child nodes without updating textContent should do
nothing

https://html.spec.whatwg.org/multipage/forms.html#the-textarea-element:textco...
> When the textarea element's textContent IDL attribute changes value, if the
> element's dirty value flag is false, then the element's raw value must be set
> to the value of the element's textContent IDL attribute.

We should do nothing if textContent isn't changed. New behavior matches to Edge,
Safari, and the standard, and doesn't match to Firefox.

BUG=698647
==========

to

==========
TEXTAREA element: Updating child nodes without updating textContent should do
nothing

https://html.spec.whatwg.org/multipage/forms.html#the-textarea-element:textco...
> When the textarea element's textContent IDL attribute changes value, if the
> element's dirty value flag is false, then the element's raw value must be set
> to the value of the element's textContent IDL attribute.

We should do nothing if textContent isn't changed. New behavior matches to Edge,
Safari, and the standard, and doesn't match to Firefox.

BUG=698647

Review-Url: https://codereview.chromium.org/2733783003
Cr-Commit-Position: refs/heads/master@{#454840}
Committed:
https://chromium.googlesource.com/chromium/src/+/5cd3e773b0851d6e56bc2bcb4680...
==========

[commit-bot: I haz the power, 2017-03-06 09:27:25]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/5cd3e773b0851d6e56bc2bcb4680...