src/vs/editor/common/modelLineProjectionData.ts/ModelLineProjectionData/getLineLength
class ModelLineProjectionData:	public getLineLength(outputLineIndex: number): number {
		// These offsets refer to model text with injected text.
		const startOffset = outputLineIndex > 0 ? this.breakOffsets[outputLineIndex - 1] : 0;
		const endOffset = this.breakOffsets[outputLineIndex];

		let lineLength = endOffset - startOffset;
		if (outputLineIndex > 0) {
			lineLength += this.wrappedTextIndentLength;
		}
		return lineLength;
	}