src/vs/editor/common/model/textModelTokens.ts/TextModelTokenization/_resetTokenizationState
class TextModelTokenization:	private _resetTokenizationState(): void {
		const [tokenizationSupport, initialState] = initializeTokenization(this._textModel, this._tokenizationPart);
		if (tokenizationSupport && initialState) {
			this._tokenizationStateStore = new TokenizationStateStore(tokenizationSupport, initialState);
		} else {
			this._tokenizationStateStore = null;
		}
		this._beginBackgroundTokenization();
	}