--- eval.c.orig	Thu May  2 21:21:06 1996
+++ eval.c	Mon Dec 31 19:08:46 2001
@@ -530,6 +530,9 @@
 		case EVTAB:	tabmask = atoi(value)-1;
 				if (tabmask != 0x07 && tabmask != 0x03)
 					tabmask = 0x07;
+				/* changed by Tadashi Yumoto */
+				if ( (tabmask+1) == 8 || (tabmask+1) == 4 )
+					tabsize = tabmask + 1;
 				curwp->w_flag |= WFHARD;
 				break;
 		case EVOVERLAP:	overlap = atoi(value);