From 8e03da855ffc5987db44b29c4d9b91a23336a678 Mon Sep 17 00:00:00 2001
From: pagedown <pg.dn@outlook.com>
Date: Mon, 14 Mar 2022 20:29:15 +0800
Subject: [PATCH] diff kitten: Fix wrong number of scrolling lines after
 context switch

---
 kittens/diff/main.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kittens/diff/main.py b/kittens/diff/main.py
index 16e00efa0..2fb69bcb6 100644
--- a/kittens/diff/main.py
+++ b/kittens/diff/main.py
@@ -293,10 +293,11 @@ class DiffHandler(Handler):
 
     def scroll_lines(self, amt: int = 1) -> None:
         new_pos = max(0, min(self.scroll_pos + amt, self.max_scroll_pos))
+        amt = new_pos - self.scroll_pos
         if new_pos == self.scroll_pos:
             self.cmd.bell()
             return
-        if abs(new_pos - self.scroll_pos) >= self.num_lines - 1:
+        if abs(amt) >= self.num_lines - 1:
             self.scroll_pos = new_pos
             self.draw_screen()
             return