306,307c306,307
<     "Extend base class: forbid insert/delete before the I/O mark"
< 
---
>     "Extend base class: redirects insert/delete after the I/O mark"
>     
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<             if self.delegate.compare(index, "<", "iomark"):
<                 self.delegate.bell()
<                 return
---
>             if self.delegate.compare(index, "<", "iomark"): 
>                 try:            # improved behavior
>                     text = self.delegate.delegate.delegate      
>                     text.mark_set("insert", "end-1c")           
>                 except:         # on error, default to old behavior
>                     self.delegate.bell()
>                     return
> 
830a836,841
> 
>         text.bind("<<cmd-history-prev>>", self.cmd_history_prev);     
>         text.bind("<<cmd-history-next>>", self.cmd_history_next);   
>         text.event_add("<<cmd-history-prev>>", "<Key-Up>");         
>         text.event_add("<<cmd-history-next>>", "<Key-Down>");       
> 
850a862,872
>     def cmd_history_prev(self, event):    
>         if self.text.compare('insert', ">=", "iomark"):
>             self.history.history_prev(event)
>             return "break"
>  
>     def cmd_history_next(self, event):  
>         if self.text.compare('insert', ">=", "iomark"):
>             self.history.history_next(event)
>             return "break"
> 
>