completion bugfix

[Zefram <zefram@dcs.warwick.ac.uk>]

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There's a bug in completion that can cause the cursor to be moved one
character before the start of the word being completed.  At the beginning
of the buffer, this can cause a crash.  Try:

% ;""

Put the cursor on the first quote, and press <tab>.  The cursor moves
before the semicolon.

The following patch fixes this bug.  I *think* that's all it does; the
old code *looks* wrong, but the logic in that function is quite opaque
so I'm not 100% certain.  If anyone knows better, please say so.

 -zefram

      Index: Src/zle_tricky.c
      ===================================================================
      RCS file: /home/zefram/usr/cvsroot/zsh/Src/zle_tricky.c,v
      retrieving revision 1.45
      diff -c -r1.45 zle_tricky.c
      *** zle_tricky.c	1996/11/09 13:29:17	1.45
      --- zle_tricky.c	1996/11/15 02:29:14
      ***************
      *** 1103,1109 ****
        			cs = i;
        			foredel(1);
        			chuck(tt--);
      ! 			if ((cs = ocs) >= i--)
        			    cs--;
        			we--;
        		    }
      --- 1103,1109 ----
        			cs = i;
        			foredel(1);
        			chuck(tt--);
      ! 			if ((cs = ocs) > i--)
        			    cs--;
        			we--;
        		    }

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