fixed bug with counter updates

src/damaris/gui/DamarisGUI.py

@@ -1384,7 +1384,7 @@ class LogWindow:
             start = tb.get_iter_at_mark( mark )
             end = tb.get_end_iter( )
             text = tb.get_text( start, end, True )
-            tb.move_mark( "lastdumped", end )
+            tb.move_mark( mark, end )
         return text
 
     def textview_keypress( self, widget, event, data=None ):