src/vs/editor/common/tokens/sparseMultilineTokens.ts/SparseMultilineTokens/getLineTokens
class SparseMultilineTokens:	public getLineTokens(lineNumber: number): SparseLineTokens | null {
		if (this._startLineNumber <= lineNumber && lineNumber <= this._endLineNumber) {
			return this._tokens.getLineTokens(lineNumber - this._startLineNumber);
		}
		return null;
	}