Fix an incorrect return value of the EventDispatcher.off function (#1747)
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@ -426,7 +426,7 @@ class EventDispatcher {
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*/
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off(eventName, callback) {
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const callbacks = this._eventMap.get(eventName);
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if (typeof callbacks === 'undefined') { return true; }
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if (typeof callbacks === 'undefined') { return false; }
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const ii = callbacks.length;
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for (let i = 0; i < ii; ++i) {
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