QmlDesigner: Add context menu to the cell

Task-number: QDS-11253
Change-Id: I4b93feb867d0d78d9e9b473c9dd6a645c031ccaf
Reviewed-by: Qt CI Patch Build Bot <ci_patchbuild_bot@qt.io>
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>

src/plugins/qmldesigner/components/collectioneditor/collectiondetailsmodel.cpp

@@ -366,8 +366,8 @@ bool CollectionDetailsModel::selectRow(int row)
 
     const int rows = rowCount();
 
-    if (m_selectedRow >= rows)
-        return false;
+    if (row >= rows)
+        row = rows - 1;
 
     selectColumn(-1);