src/vs/editor/common/model/tokenizationTextModelPart.ts/TokenizationTextModelPart/tokenizeLineWithEdit
class TokenizationTextModelPart:	public tokenizeLineWithEdit(
		position: IPosition,
		length: number,
		newText: string
	): LineTokens | null {
		const validatedPosition = this._textModel.validatePosition(position);
		return this._tokenization.tokenizeLineWithEdit(
			validatedPosition,
			length,
			newText
		);
	}