src/vs/editor/common/viewModel/viewModelLines.ts/ViewModelLinesFromProjectedModel/getViewLineNumberOfModelPosition
class ViewModelLinesFromProjectedModel:	public getViewLineNumberOfModelPosition(modelLineNumber: number, modelColumn: number): number {
		let lineIndex = modelLineNumber - 1;
		if (this.modelLineProjections[lineIndex].isVisible()) {
			// this model line is visible
			const deltaLineNumber = 1 + this.projectedModelLineLineCounts.getPrefixSum(lineIndex);
			return this.modelLineProjections[lineIndex].getViewLineNumberOfModelPosition(deltaLineNumber, modelColumn);
		}

		// this model line is not visible
		while (lineIndex > 0 && !this.modelLineProjections[lineIndex].isVisible()) {
			lineIndex--;
		}
		if (lineIndex === 0 && !this.modelLineProjections[lineIndex].isVisible()) {
			// Could not reach a real line
			return 1;
		}
		const deltaLineNumber = 1 + this.projectedModelLineLineCounts.getPrefixSum(lineIndex);
		return this.modelLineProjections[lineIndex].getViewLineNumberOfModelPosition(deltaLineNumber, this.model.getLineMaxColumn(lineIndex + 1));
	}