From 9c557407d6eb49d247ca1206660b4c3af64a6e7f Mon Sep 17 00:00:00 2001
From: Joe Wilm <joe@jwilm.com>
Date: Sun, 30 Apr 2017 21:32:11 -0700
Subject: [PATCH] Add limit check in scroll_up/down_relative

---
 src/term/mod.rs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/term/mod.rs b/src/term/mod.rs
index 191a1e04..ecf12265 100644
--- a/src/term/mod.rs
+++ b/src/term/mod.rs
@@ -960,7 +960,8 @@ impl Term {
     /// Expects origin to be in scroll range.
     #[inline]
     fn scroll_down_relative(&mut self, origin: Line, lines: Line) {
-        trace!("scroll_down: {}", lines);
+        trace!("scroll_down_relative: origin={}, lines={}", origin, lines);
+        let lines = min(lines, self.scroll_region.end - self.scroll_region.start);
 
         // Copy of cell template; can't have it borrowed when calling clear/scroll
         let template = self.empty_cell;
@@ -981,7 +982,8 @@ impl Term {
     /// Expects origin to be in scroll range.
     #[inline]
     fn scroll_up_relative(&mut self, origin: Line, lines: Line) {
-        trace!("scroll_up: {}", lines);
+        trace!("scroll_up_relative: origin={}, lines={}", origin, lines);
+        let lines = min(lines, self.scroll_region.end - self.scroll_region.start);
 
         // Copy of cell template; can't have it borrowed when calling clear/scroll
         let template = self.empty_cell;