From cece84629778acb687c1ed322c57419158483ceb Mon Sep 17 00:00:00 2001
From: Zachary Yedidia <zyedidia@gmail.com>
Date: Tue, 5 Apr 2016 12:50:07 -0400
Subject: [PATCH] Fix half page down bug

---
 src/view.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/view.go b/src/view.go
index 351f37ad..f9d90e8f 100644
--- a/src/view.go
+++ b/src/view.go
@@ -179,7 +179,9 @@ func (v *View) HalfPageDown() {
 	if len(v.buf.lines)-(v.topline+v.height) > v.height/2 {
 		v.ScrollDown(v.height / 2)
 	} else {
-		v.topline = len(v.buf.lines) - v.height
+		if len(v.buf.lines) >= v.height {
+			v.topline = len(v.buf.lines) - v.height
+		}
 	}
 }