qml/MediaGroupList: Fix double click on TableView

modules/gui/qt/medialibrary/qml/MediaGroupList.qml

@@ -370,6 +370,9 @@ FocusScope {
 
             onActionForSelection: _actionAtIndex()
 
+            // NOTE: We make sure we're double clicking on a group.
+            onItemDoubleClicked: if (model.count > 1) showList(model, Qt.MouseFocusReason)
+
             onContextMenuButtonClicked: contextMenu.popup(modelSelect.selectedIndexes,
                                                           menuParent.mapToGlobal(0,0))