Also add wxGridCellEditorPtr and wxGridCellRendererPtr

This is similar to the previous commit and replaces manual calls to
DecRef() on the renderers/editors with the use of smart pointers for
them too.

interface/wx/grid.h

@@ -95,6 +95,20 @@ protected:
     virtual ~wxGridCellRenderer();
 };
 
+/**
+    Smart pointer wrapping wxGridCellRenderer.
+
+    wxGridCellRendererPtr takes ownership of wxGridCellRenderer passed to it on
+    construction and calls DecRef() on it automatically when it is destroyed.
+    It also provides transparent access to wxGridCellRenderer methods by allowing
+    to use objects of this class as if they were wxGridCellRenderer pointers.
+
+    @since 3.1.4
+
+    @category{grid}
+*/
+typedef wxObjectDataPtr<wxGridCellRenderer> wxGridCellRendererPtr;
+
 /**
     @class wxGridCellAutoWrapStringRenderer
 
@@ -591,6 +605,20 @@ protected:
     virtual ~wxGridCellEditor();
 };
 
+/**
+    Smart pointer wrapping wxGridCellEditor.
+
+    wxGridCellEditorPtr takes ownership of wxGridCellEditor passed to it on
+    construction and calls DecRef() on it automatically when it is destroyed.
+    It also provides transparent access to wxGridCellEditor methods by allowing
+    to use objects of this class as if they were wxGridCellEditor pointers.
+
+    @since 3.1.4
+
+    @category{grid}
+*/
+typedef wxObjectDataPtr<wxGridCellEditor> wxGridCellEditorPtr;
+
 /**
     @class wxGridCellAutoWrapStringEditor
 
@@ -1058,9 +1086,22 @@ public:
 
     /**
         Returns the cell editor.
+
+        The caller is responsible for calling DecRef() on the returned pointer,
+        use GetEditorPtr() to do it automatically.
     */
     wxGridCellEditor* GetEditor(const wxGrid* grid, int row, int col) const;
 
+    /**
+        Returns the cell editor.
+
+        This method is identical to GetEditor(), but returns a smart pointer,
+        which frees the caller from the need to call DecRef() manually.
+
+        @since 3.1.4
+     */
+    wxGridCellEditorPtr GetEditorPtr(const wxGrid* grid, int row, int col) const;
+
     /**
         Returns the font.
     */
@@ -1091,9 +1132,22 @@ public:
 
     /**
         Returns the cell renderer.
+
+        The caller is responsible for calling DecRef() on the returned pointer,
+        use GetRendererPtr() to do it automatically.
     */
     wxGridCellRenderer* GetRenderer(const wxGrid* grid, int row, int col) const;
 
+    /**
+        Returns the cell editor.
+
+        This method is identical to GetRenderer(), but returns a smart pointer,
+        which frees the caller from the need to call DecRef() manually.
+
+        @since 3.1.4
+     */
+    wxGridCellRendererPtr GetRendererPtr(const wxGrid* grid, int row, int col) const;
+
     /**
         Returns the text colour.
     */