Add wxDataViewListCtrl::GetItemCount().

This method is convenient and (almost, except for the return value) compatible
with wxListCtrl.

See #11088.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71563 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/dataview.h

@@ -2337,6 +2337,13 @@ public:
     */
     void DeleteAllItems();
 
+    /**
+        Returns the number of items (=rows) in the control
+
+        @since 2.9.4
+    */
+    unsigned int GetItemCount() const;
+
     /**
         Returns the client data associated with the item.
 
@@ -2710,6 +2717,13 @@ public:
     */
     void DeleteAllItems();
 
+    /**
+        Returns the number of items (=rows) in the control
+
+        @since 2.9.4
+    */
+    unsigned int GetItemCount() const;
+
     /**
         Returns the client data associated with the item.