src/vs/editor/common/viewModel/viewModelLines.ts/ViewModelLinesFromProjectedModel/getModelLineViewLineCount
class ViewModelLinesFromProjectedModel:	public getModelLineViewLineCount(modelLineNumber: number): number {
		if (modelLineNumber < 1 || modelLineNumber > this.modelLineProjections.length) {
			// invalid arguments
			return 1;
		}
		return this.modelLineProjections[modelLineNumber - 1].getViewLineCount();
	}