Bug 267936 – Element::parserSetAttributes shouldn't trigger shadow tree construction in TextFieldInputType::attributeChanged

• Component: Forms
• Status: RESOLVED FIXED

[Ryosuke Niwa]

We're always creating input element's shadow tree inside Element::parserSetAttributes because of this following code in TextFieldInputType:

```
void TextFieldInputType::attributeChanged(const QualifiedName& name)
{
    if (name == valueAttr || name == placeholderAttr) {
        if (element())
            updateInnerTextValue();
    }
    InputType::attributeChanged(name);
}
```

Don't do that.

[Ryosuke Niwa]

Pull request: https://github.com/WebKit/WebKit/pull/23111

[EWS]

Committed 273461@main (66bf68c9f459): <https://commits.webkit.org/273461@main>

Reviewed commits have been landed. Closing PR #23111 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/121567802>