SINGLE_LINE_ZLE changes for better ksh emulation

[Zefram <A.Main@xxxxxxxxxxxxxxxxx>]

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The patch below make SINGLE_LINE_ZLE behave rather more like ksh.
Instead of putting < at the beginning of the line to indicate continuation
to the left, it puts it at the end; continuations in both directions are
indicated by a +.  A space is left before the continuation character.
It's still not a perfect copy of ksh, as we scroll the prompt whereas
ksh keeps it on screen, but zsh prompts are often quite long compared
to ksh prompts so this makes sense.

 -zefram

      Index: Src/zle_refresh.c
      ===================================================================
      RCS file: /home/zefram/usr/cvsroot/zsh/Src/zle_refresh.c,v
      retrieving revision 1.7
      diff -c -r1.7 zle_refresh.c
      *** zle_refresh.c	1996/07/17 10:06:37	1.7
      --- zle_refresh.c	1996/07/17 10:46:06
      ***************
      *** 852,857 ****
      --- 852,858 ----
            int t0,			/* tmp			       */
        	vsiz,			/* size of new video buffer    */
        	nvcs = 0;		/* new video cursor column     */
      +     char rchar = 0;		/* continuation indicator      */
        
            nlnct = 1;
        /* generate the new line buffer completely */
      ***************
      *** 860,866 ****
        	    vsiz = (vsiz | 7) + 1;
        	else if (icntrl(line[t0]))
        	    vsiz++;
      !     vbuf = (char *)zalloc(vsiz);
        
            if (cs < 0) {
        #ifdef DEBUG
      --- 861,867 ----
        	    vsiz = (vsiz | 7) + 1;
        	else if (icntrl(line[t0]))
        	    vsiz++;
      !     vbuf = (char *)zalloc(vsiz + winw);
        
            if (cs < 0) {
        #ifdef DEBUG
      ***************
      *** 875,886 ****
            vp = vbuf + pptw;
        
            for (t0 = 0; t0 != ll; t0++) {
      ! 	if (line[t0] == '\t')
        	    for (*vp++ = ' '; (vp - vbuf) & 7; )
        		*vp++ = ' ';
      - 	else if (line[t0] == '\n') {
      - 	    *vp++ = '\\';
      - 	    *vp++ = 'n';
        	} else if (line[t0] == 0x7f) {
        	    *vp++ = '^';
        	    *vp++ = '?';
      --- 876,884 ----
            vp = vbuf + pptw;
        
            for (t0 = 0; t0 != ll; t0++) {
      ! 	if (line[t0] == '\t') {
        	    for (*vp++ = ' '; (vp - vbuf) & 7; )
        		*vp++ = ' ';
        	} else if (line[t0] == 0x7f) {
        	    *vp++ = '^';
        	    *vp++ = '?';
      ***************
      *** 897,910 ****
            *vp = '\0';
        
        /* determine which part of the new line buffer we want for the display */
      !     if ((winpos && nvcs < winpos + 1) || (nvcs > winpos + winw - 2)) {
        	if ((winpos = nvcs - ((winw - hasam) / 2)) < 0)
        	    winpos = 0;
            }
      !     if (winpos)
      ! 	vbuf[winpos] = '<';	/* line continues to the left */
      !     if ((int)strlen(vbuf + winpos) > (winw - hasam)) {
      ! 	vbuf[winpos + winw - hasam - 1] = '>';	/* line continues to right */
        	vbuf[winpos + winw - hasam] = '\0';
            }
            strcpy(nbuf[0], vbuf + winpos);
      --- 895,914 ----
            *vp = '\0';
        
        /* determine which part of the new line buffer we want for the display */
      !     if ((winpos && nvcs < winpos + 1) || (nvcs > winpos + winw - hasam - 3)) {
        	if ((winpos = nvcs - ((winw - hasam) / 2)) < 0)
        	    winpos = 0;
            }
      !     if(winpos)
      ! 	rchar = '<';   /* continuation to the left */
      !     if ((int)strlen(vbuf + winpos) > (winw - hasam - 2*!!rchar))
      ! 	rchar = rchar ? '+' : '>';   /* continuation to the right */
      !     if (rchar) {
      ! 	char *p;
      ! 	for(p = strchr(vbuf, 0); p < vbuf + winpos + winw - hasam - 2; p++)
      ! 	    *p = ' ';
      ! 	vbuf[winpos + winw - hasam - 2] = ' ';
      ! 	vbuf[winpos + winw - hasam - 1] = rchar;
        	vbuf[winpos + winw - hasam] = '\0';
            }
            strcpy(nbuf[0], vbuf + winpos);

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