From 6d52424303bf92a9abcfe8daa45cff145966f820 Mon Sep 17 00:00:00 2001
From: Blaž Hrastnik
Date: Wed, 11 Aug 2021 13:53:38 +0900
Subject: fix: Adjust scroll offset/padding calculation to prevent wobble

Fixes #324
---
 helix-view/src/view.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'helix-view/src/view.rs')

diff --git a/helix-view/src/view.rs b/helix-view/src/view.rs
index 25efbde5..265f7df8 100644
--- a/helix-view/src/view.rs
+++ b/helix-view/src/view.rs
@@ -93,7 +93,10 @@ impl View {
         let height = self.area.height.saturating_sub(1); // - 1 for statusline
         let last_line = (self.first_line + height as usize).saturating_sub(1);
 
-        let scrolloff = scrolloff.min(self.area.height as usize / 2);
+        // - 1 so we have at least one gap in the middle.
+        // a height of 6 with padding of 3 on each side will keep shifting the view back and forth
+        // as we type
+        let scrolloff = scrolloff.min(height.saturating_sub(1) as usize / 2);
 
         // TODO: not ideal
         const OFFSET: usize = 7; // 1 diagnostic + 5 linenr + 1 gutter
-- 
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