Re: [editing] remove the targetRange from edit events, if the targetRange is equal to the selection (#80)

@rniwa Exactly. And I assume that this also applies to any future `editType` that for whatever reason is unrelated to the caret/selection, right? So basically we remove the range info from `targetRange` (set it to `null`) whenever the selection range and `targetRange` would be the same anyway, and right now that's all cases except `replaceContent`. I guess for this to work, we need to specify that the events are fired synchronously and before the selection has any chance to change, right? I briefly spoke with Apple's Sam (?) yesterday, and he mentioned that we need to specify how it relates to the event loop. 

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