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