src/vs/editor/contrib/quickAccess/browser/gotoLineQuickAccess.ts/AbstractGotoLineQuickAccessProvider/isValidColumn
class AbstractGotoLineQuickAccessProvider:	private isValidColumn(editor: IEditor, lineNumber: number, column: number | undefined): boolean {
		if (!column || typeof column !== 'number') {
			return false;
		}

		const model = this.getModel(editor);
		if (!model) {
			return false;
		}

		const positionCandidate = { lineNumber, column };

		return model.validatePosition(positionCandidate).equals(positionCandidate);
	}