Avoid emitting change events for void operations #4195
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Closes #4190
The cause is that when
deleteText()doesn't do anything (either length is0orindexis after the end),changepassed toEditor#update()would be a delta that contains a void retain (e.g.new Delta().retain(10)), which causeseditor-change/text-changeto be emitted with that delta.This PR fixed the issue by always calling
chop()when the provided change will be used.