rope: Improve panic message for out of bounds anchor_at_offset (#40256)

Release Notes: - N/A *or* Added/Fixed/Improved ...
2025-10-15 14:36:58 +00:00
parent c814b99fcb
commit 85c2dc909d
2 changed files with 10 additions and 1 deletions
@@ -2400,7 +2400,9 @@ impl BufferSnapshot {
        } else if bias == Bias::Right && offset == self.len() {
            Anchor::MAX
        } else {
-            if !self.visible_text.is_char_boundary(offset) {
+            if offset > self.visible_text.len() {
+                panic!("offset {} is out of bounds", offset)
+            } else if !self.visible_text.is_char_boundary(offset) {
                // find the character
                let char_start = self.visible_text.floor_char_boundary(offset);
                // `char_start` must be less than len and a char boundary