need ancestorChainHasListenerOfType(type) to avoid malloc during event dispatch

• Component: New Bugs
• Status: RESOLVED DUPLICATE

[Eric Seidel (no email)]

need ancestorChainHasListenerOfType(type) to avoid malloc during event dispatch

Certain events could benifit from a function to check if any ancestor has a listener of a specific type.

Such events include:
SVGLoad
mouseMoved
and DOM Mutation events

This would allow us to trade a treewalk for a malloc.  The treewalk is likely to be less expensive.

This would also require us to re-work how event listeners are stored.  Using a HashMap<AtomicString, Vector<EventListenter> > would be required instead, to allow O(1) lookup of events based on type.

[Eric Seidel (no email)]

*** This bug has been marked as a duplicate of 16447 ***