From 19bd0685994ed6b63b403d0fc59457e6118237ef Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 10 Sep 2017 12:29:36 +0530
Subject: [PATCH] Raise an error on negative scroll amounts

---
 kitty/screen.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kitty/screen.c b/kitty/screen.c
index 69a5d7dce..f4705b06f 100644
--- a/kitty/screen.c
+++ b/kitty/screen.c
@@ -1336,7 +1336,10 @@ scroll(Screen *self, PyObject *args) {
             amt = self->historybuf->count;
             break;
         default:
-            amt = MAX(0, amt);
+            if (amt < 0) {
+                PyErr_SetString(PyExc_ValueError, "scroll amounts must be positive numbers");
+                return NULL;
+            }
             break;
     }
     if (!upwards) {