src/vs/editor/common/model/textModel.ts/DidChangeContentEmitter/fire
class DidChangeContentEmitter:	public fire(e: InternalModelContentChangeEvent): void {
		if (this._deferredCnt > 0) {
			if (this._deferredEvent) {
				this._deferredEvent = this._deferredEvent.merge(e);
			} else {
				this._deferredEvent = e;
			}
			return;
		}
		this._fastEmitter.fire(e);
		this._slowEmitter.fire(e);
	}