[NB] update arrays of records lowering (#11956)

- when lowering the children of record arrays inherit the array type dimensions to the children

OMCompiler/Compiler/NFFrontEnd/NFVariable.mo

@@ -35,6 +35,7 @@ encapsulated uniontype NFVariable
   import Class = NFClass;
   import Component = NFComponent;
   import ComponentRef = NFComponentRef;
+  import Dimension = NFDimension;
   import Expression = NFExpression;
   import NFInstNode.InstNode;
   import NFPrefixes.Visibility;
@@ -204,10 +205,23 @@ public
     "Expands a variable into itself and its children if its complex."
     input Variable var;
     output list<Variable> children;
+  protected
+    function expandChildType
+      "helper function to inherit the array type dimensions"
+      input output Variable child;
+      input list<Dimension> dimensions;
+    algorithm
+      child.ty := Type.liftArrayLeftList(child.ty, dimensions);
+    end expandChildType;
   algorithm
-    children := if (isComplex(var) or isComplexArray(var))
-      then var :: List.flatten(list(expandChildren(v) for v in var.children))
-      else {var};
+    // for non-complex variables the children are empty therefore it will be returned itself
+    var.children := List.flatten(list(expandChildren(v) for v in var.children));
+    if isComplexArray(var) then
+      // if the variable is an array, inherit the array dimensions
+      var.children := list(expandChildType(v, Type.arrayDims(var.ty)) for v in var.children);
+    end if;
+    // return all children and the variable itself
+    children := var :: var.children;
   end expandChildren;
 
   function typeOf