From a6852fb88f72ea6bb41b19e65b531c17662ba57d Mon Sep 17 00:00:00 2001
From: Leoi Hung Kin <leoihungkin@outlook.com>
Date: Sat, 9 Oct 2021 19:34:10 +0800
Subject: [PATCH] Picker: Don't panick at move_up/move_down when matches is
 empty (#818)

---
 helix-term/src/ui/picker.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/helix-term/src/ui/picker.rs b/helix-term/src/ui/picker.rs
index c5b90a9c..9be2a73e 100644
--- a/helix-term/src/ui/picker.rs
+++ b/helix-term/src/ui/picker.rs
@@ -270,12 +270,18 @@ impl<T> Picker<T> {
     }
 
     pub fn move_up(&mut self) {
+        if self.matches.is_empty() {
+            return;
+        }
         let len = self.matches.len();
         let pos = ((self.cursor + len.saturating_sub(1)) % len) % len;
         self.cursor = pos;
     }
 
     pub fn move_down(&mut self) {
+        if self.matches.is_empty() {
+            return;
+        }
         let len = self.matches.len();
         let pos = (self.cursor + 1) % len;
         self.cursor = pos;