oops, restored the postpone-redraw-if-dirty test which was somehow left out

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10968 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/listctrl.cpp

@@ -41,6 +41,10 @@
             ... we have it ourselves ...
         else
             line->GetFoo();
+
+   => done
+
+   5. attributes support: we need OnGetItemAttr() as well!
  */
 
 // ============================================================================
@@ -2417,6 +2421,12 @@ void wxListMainWindow::OnPaint( wxPaintEvent &WXUNUSED(event) )
         return;
     }
 
+    if ( m_dirty )
+    {
+        // delay the repainting until we calculate all the items positions
+        return;
+    }
+
     PrepareDC( dc );
 
     int dev_x, dev_y;