src/vs/editor/common/viewModel/viewModelImpl.ts/ViewModel/getLineLastNonWhitespaceColumn
class ViewModel:	public getLineLastNonWhitespaceColumn(lineNumber: number): number {
		const result = strings.lastNonWhitespaceIndex(this.getLineContent(lineNumber));
		if (result === -1) {
			return 0;
		}
		return result + 2;
	}