From 0895fbf911f45a5a2a05bb8e790b6ecf39174f30 Mon Sep 17 00:00:00 2001
From: fr33domlover <fr33domlover@riseup.net>
Date: Thu, 24 May 2018 22:20:52 +0000
Subject: [PATCH] Minimal diff context line number is 1, not 0, latter caused
 vector slice error

---
 src/Vervis/Widget/Repo.hs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Vervis/Widget/Repo.hs b/src/Vervis/Widget/Repo.hs
index 20773f6..1b5b51b 100644
--- a/src/Vervis/Widget/Repo.hs
+++ b/src/Vervis/Widget/Repo.hs
@@ -119,7 +119,7 @@ addContext ctx orig = prepend . foldr f (undefined, [])
         )
     prepend ((_       , _       ), [])   = []
     prepend ((startOld, startNew), l:ls) =
-        let o = max 0 $ startOld - ctx
+        let o = max 1 $ startOld - ctx
             len = min (startOld - o) ctx
         in  (context orig o (startNew - len) len ++ l) : ls