menu completion cleanup

[Zefram <zefram@xxxxxxxxxxxxxxxxx>]

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My recent patch for removable suffixes makes invalidatelist() reset
lastambig.  This means that the test of lastcmd when starting menu
completion with AUTO_MENU is no longer necessary.

 -zefram

      *** Src/Zle/zle_tricky.c	1997/01/11 17:59:12	1.10
      --- Src/Zle/zle_tricky.c	1997/01/11 19:45:02
      ***************
      *** 508,516 ****
            
            /* Check if we have to start a menu-completion (via automenu). */
        
      !     if ((amenu = (isset(AUTOMENU) &&
      ! 		       (lastcmd & ZLE_MENUCMP) &&
      ! 		       lastambig)))
        	usemenu = 1;
        
            /* Expand history references before starting completion.  If anything *
      --- 508,514 ----
            
            /* Check if we have to start a menu-completion (via automenu). */
        
      !     if ((amenu = (isset(AUTOMENU) && lastambig)))
        	usemenu = 1;
        
            /* Expand history references before starting completion.  If anything *

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