screen discards undefined escape sequences

screen discards certain escape sequences.  For example if you run this:
echo ^[Hello        # where ^[ is an actual escape character

you get this:
ello

Emacs' term-mode looks for an escape sequence (^[AnSiT) to do directory
tracking.  This fails inside of screen because screen discards the ^[A.

DoESC in ansi.c looks like the culprit to me.  If intermediate is 0 and
the escape sequence is not special to screen, DoESC does nothing with
the sequence--it gets dropped.  Is there a reason for this behavior?

I've come close to fixing it but haven't gotten it quite right.  Can
somebody give me a clue how I can get screen to send ^[A to the
screen?  I've tried using a modified version of what looks like the
"OK, print this character" code from ansi.c (below) but I haven't been
able to get it quite right.  I end up with a colored character before
the A and it screen dies at random times :(

Thanks for any insight!

      if (curr->w_insert)
	{
	  save_mline(&curr->w_mlines[curr->w_y], cols);
	  MInsChar(curr, &curr->w_rend, curr->w_x, curr->w_y);
	  LInsChar(&curr->w_layer, &curr->w_rend, curr->w_x, curr->w_y, &mline_old);
	  curr->w_x++;
	}
      else
	{
	  MPutChar(curr, &curr->w_rend, curr->w_x, curr->w_y);
	  LPutChar(&curr->w_layer, &curr->w_rend, curr->w_x, curr->w_y);
	  curr->w_x++;
	}


 

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