feat: deselect items

src/main.rs

@@ -92,12 +92,17 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                     if let Some(i) = state.selected()
                         && i < marked.len()
                     {
+                        assert!(i < marked.len());
+                        if marked[i] {
+                            marked[i] = false;
+                        } else {
                             marked[i] = true;
                             // move cursor down
-                        let next = if i + 1 < lines.len() { i + 1 } else { i };
+                            let next = lines.len().min(i + 1);
                             state.select(Some(next));
                         }
                     }
+                }
                 _ => {}
             }
         }