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vt: on resize, restore screen using history buffer

--- a/sys/src/cmd/vt/main.c

+++ b/sys/src/cmd/vt/main.c

@@ -579,6 +579,8 @@

 	olines = 0;

 	exportsize();

 	clear(screen->r);

+	if(resize_flag > 1)

+		backup(backc);

 	resize_flag = 0;

 	werrstr("");		/* clear spurious error messages */

 }

@@ -684,7 +686,13 @@

 	register char *cp;

 	eresized(0);

-	n = 3*(count+1)*ymax/4;

+	if(count == 0 && !pagemode) {

+		n = ymax;

+		nbacklines = HISTSIZ;	/* make sure we scroll to the very end */

+	} else{

+		n = 3*(count+1)*ymax/4;

+		nbacklines = ymax-1;

+	}

 	cp = histp;

 	atend = 0;

 	while (n >= 0) {

@@ -702,7 +710,6 @@

 	if(cp >= &hist[HISTSIZ])

 		cp = hist;

 	backp = cp;

-	nbacklines = ymax-2;

 }

 Point

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