mark deleted when using narrow()/widen()?

["Mack Stevenson" <mackstevenson@xxxxxxxxxxx>]

Howdy

I am trying to use an update_hook to perform some processing on highlighted 
regions. The code I've come up with looks as follows

define f()
{
   if (markp() != 0)
    {
       narrow();

       % ...

       widen();
    }

}

set_buffer_hook("update_hook", "f");

My problem is that the moment narrow() is called the selection terminates: 
the mark is no longer set (adding an else clause to the markp() test above 
that prints a simple message shows that it is so - I think).

What am I missing? Is this (ie, using an update_hook) even the right 
approach to perform simple actions on text being selected?

Thanks in advance for any help

Mack

----

Mack Stevenson
mackstevenson@xxxxxxxxxxx

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