diff -r 57e8b75298d6 src/move.c
--- a/src/move.c	Tue Oct 23 05:35:34 2012 +0200
+++ b/src/move.c	Mon Nov 05 20:32:52 2012 +0100
@@ -2576,7 +2576,7 @@
     else
 	topline_back(lp);
     h2 = lp->height;
-    if (h2 + h1 > min_height)
+    if (h2 == MAXCOL || h2 + h1 > min_height)
     {
 	*lp = loff0;	/* no overlap */
 	return;
@@ -2588,7 +2588,7 @@
     else
 	topline_back(lp);
     h3 = lp->height;
-    if (h3 + h2 > min_height)
+    if (h3 == MAXCOL || h3 + h2 > min_height)
     {
 	*lp = loff0;	/* no overlap */
 	return;
@@ -2600,7 +2600,7 @@
     else
 	topline_back(lp);
     h4 = lp->height;
-    if (h4 + h3 + h2 > min_height || h3 + h2 + h1 > min_height)
+    if (h4 == MAXCOL + h4 + h3 + h2 > min_height || h3 + h2 + h1 > min_height)
 	*lp = loff1;	/* 1 line overlap */
     else
 	*lp = loff2;	/* 2 lines overlap */