LibWeb: Reset form association when the element's form attribute changes

Author: https://github.com/trflynn89
Commit: 960dcf0e56
Pull-request: https://github.com/SerenityOS/serenity/pull/23032
Issue: https://github.com/SerenityOS/serenity/issues/22537
Issue: https://github.com/SerenityOS/serenity/issues/22705
Issue: https://github.com/SerenityOS/serenity/issues/23008
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/Lubrsi

Userland/Libraries/LibWeb/HTML/HTMLTextAreaElement.h

@@ -55,9 +55,6 @@ public:
     // https://html.spec.whatwg.org/multipage/forms.html#category-autocapitalize
     virtual bool is_auto_capitalize_inheriting() const override { return true; }
 
-    // ^HTMLElement
-    virtual void attribute_changed(FlyString const&, Optional<String> const&) override;
-
     // https://html.spec.whatwg.org/multipage/forms.html#category-label
     virtual bool is_labelable() const override { return true; }
 
@@ -65,6 +62,7 @@ public:
 
     virtual void form_associated_element_was_inserted() override;
     virtual void form_associated_element_was_removed(DOM::Node*) override;
+    virtual void form_associated_element_attribute_changed(FlyString const&, Optional<String> const&) override;
 
     virtual void children_changed() override;