EditContext spec should define composition events as they are (not?) fired on EditContext editing host

[masayuki-nakano]

https://w3c.github.io/edit-context/#edit-context-differences

The EditContext editing host receives key events and the beforeinput event as specified in [uievents].

IIRC, EditContext has its own way to notify web apps of composition. So I think composition events should not be fired on there, but it's not defined in the "Differences for an EditContext editing host" section.

[johanneswilm]

@masayuki-nakano Does that not go against what we resolved on in #69 where we decided that the JS author should listen to composition events?

[dandclark]

In #69 we removed some properties from the EditContext but I don't think it affected when and where events fire.

I agree with @masayuki-nakano that it looks like https://w3c.github.io/edit-context/#edit-context-differences should reflect that composition events are not fired on the EditContext editing host, since they are fired on the EditContext instead.

This is not a change in behavior, just something that is unclear in the spec.