fix: Adjust scroll offset/padding calculation to prevent wobble

Fixes #324

1 files changed, 4 insertions, 1 deletions

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