src/vs/editor/common/tokens/sparseMultilineTokens.ts/SparseMultilineTokensStorage/getRange
class SparseMultilineTokensStorage:	public getRange(): Range | null {
		const tokenCount = this._getTokenCount();
		if (tokenCount === 0) {
			return null;
		}
		const startChar = this._getStartCharacter(0);
		const maxDeltaLine = this._getDeltaLine(tokenCount - 1);
		const endChar = this._getEndCharacter(tokenCount - 1);
		return new Range(0, startChar + 1, maxDeltaLine, endChar + 1);
	}