[beta12] Really minor ZLE listing bug

[Zefram <A.Main@xxxxxxxxxxxxxxxxx>]

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Here's a `fun' bug: with alwayslastprompt set, get a completion listing
on the screen, below the prompt, then press ^C.  You get a new prompt
as usual, but it immediately puts the old (still valid) list beneath
the prompt.  It's possible to get the same symptom with EOF if one
fiddles a bit.  This doesn't actually crash zsh, AFAICT, but it is
wrong behaviour.  So here's the fix.

      *** 1.1	1995/11/23 06:07:30
      --- Src/zle_main.c	1995/12/12 21:48:32
      ***************
      *** 479,484 ****
      --- 479,485 ----
        	    refresh();
            }
            statusline = NULL;
      +     invalidatelist();
            trashzle();
            zleactive = 0;
            alarm(0);

 -zefram

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