src/vs/workbench/services/editor/browser/editorResolverService.ts/EditorResolverService/resolveUntypedInputAndGroup
class EditorResolverService:	private resolveUntypedInputAndGroup(editor: IUntypedEditorInput, preferredGroup: PreferredGroup | undefined): [IUntypedEditorInput, IEditorGroup, EditorActivation | undefined] | undefined {
		const untypedEditor = editor;

		// Use the untyped editor to find a group
		const [group, activation] = this.instantiationService.invokeFunction(findGroup, untypedEditor, preferredGroup);

		return [untypedEditor, group, activation];
	}