From bfa5dd52ddc1a57f79ea76d785abc106421fb1eb Mon Sep 17 00:00:00 2001
From: Antonio Scandurra <me@as-cii.com>
Date: Tue, 29 Mar 2022 13:49:09 +0200
Subject: [PATCH] Don't underflow when calling `symbols_containing_offset(0)`

---
 crates/language/src/buffer.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/crates/language/src/buffer.rs b/crates/language/src/buffer.rs
index 36ef7d4a01..0c1ce7c228 100644
--- a/crates/language/src/buffer.rs
+++ b/crates/language/src/buffer.rs
@@ -1684,7 +1684,8 @@ impl BufferSnapshot {
         theme: Option<&SyntaxTheme>,
     ) -> Option<Vec<OutlineItem<Anchor>>> {
         let position = position.to_offset(&self);
-        let mut items = self.outline_items_containing(position - 1..position + 1, theme)?;
+        let mut items =
+            self.outline_items_containing(position.saturating_sub(1)..position + 1, theme)?;
         let mut prev_depth = None;
         items.retain(|item| {
             let result = prev_depth.map_or(true, |prev_depth| item.depth > prev_depth);