window.event should not be affected by nodes moving post-dispatch

• Component: DOM
• Status: RESOLVED FIXED

[Chris Dumez]

window.event should not be affected by nodes moving post-dispatch:
- https://dom.spec.whatwg.org/#concept-event-listener-invoke

In particular, window.event should not get set when the event target was inside a shadow tree initially when dispatchEvent() got called, even if the event target gets moved out of the shadow tree during the execution of the event listeners.

[Chris Dumez]

Created attachment 413355 [details]
Patch

[Geoffrey Garen]

Comment on attachment 413355 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=413355&action=review

r=me

> Source/WebCore/dom/Event.cpp:134
> +    m_currentTargetIsInShadowTree = isInShadowTree.valueOr(is<Node>(currentTarget) && downcast<Node>(*currentTarget).isInShadowTree());

Fancy!

[Darin Adler]

Comment on attachment 413355 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=413355&action=review

>> Source/WebCore/dom/Event.cpp:134
>> +    m_currentTargetIsInShadowTree = isInShadowTree.valueOr(is<Node>(currentTarget) && downcast<Node>(*currentTarget).isInShadowTree());
> 
> Fancy!

Too fancy! The argument to valueOr is going to be computed unconditionally; do we really want that?

[Chris Dumez]

(In reply to Darin Adler from comment #3)
> Comment on attachment 413355 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=413355&action=review
> 
> >> Source/WebCore/dom/Event.cpp:134
> >> +    m_currentTargetIsInShadowTree = isInShadowTree.valueOr(is<Node>(currentTarget) && downcast<Node>(*currentTarget).isInShadowTree());
> > 
> > Fancy!
> 
> Too fancy! The argument to valueOr is going to be computed unconditionally;
> do we really want that?

Fair point. Will fix.

[Chris Dumez]

Created attachment 413376 [details]
Patch

[EWS]

Committed r269500: <https://trac.webkit.org/changeset/269500>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 413376 [details].

[Radar WebKit Bug Importer]

<rdar://problem/71102768>