Correct an unsound optimization in event dispatch.

This commit is contained in:
Ms2ger 2016-09-12 16:03:46 +02:00
parent 6cb43f213e
commit 3eaf1c1b89
3 changed files with 12 additions and 14 deletions

View file

@ -112,19 +112,23 @@ pub fn dispatch_event(target: &EventTarget,
assert_eq!(event.phase(), EventPhase::None);
assert!(event.GetCurrentTarget().is_none());
// Step 1.
event.mark_as_dispatching();
// Step 2.
event.set_target(target_override.unwrap_or(target));
if event.stop_propagation() {
// If the event's stop propagation flag is set, we can skip everything because
// it prevents the calls of the invoke algorithm in the spec and we asserted
// at the beginning that steps 10-12 don't need to be executed.
// it prevents the calls of the invoke algorithm in the spec.
// Step 10-12.
event.clear_dispatching_flags();
// Step 14.
return !event.DefaultPrevented();
}
// Step 1. Postponed here for the reason stated above.
event.mark_as_dispatching();
// Step 3. The "invoke" algorithm is only used on `target` separately,
// so we don't put it in the path.
rooted_vec!(let mut event_path);