simplify FutureMoves::move_history

src/logic/future_moves.rs

@@ -331,7 +331,7 @@ impl FutureMoves {
     }
 
     fn move_history(&self, idx: usize) -> Option<Vec<(MoveCoord, Piece)>> {
-        if let Some(root) = self.current_root {
+        self.current_root.and_then(|root| {
             let mut hist = Vec::new();
 
             let mut current = Some(idx);
@@ -351,9 +351,7 @@ impl FutureMoves {
             }
 
             Some(hist)
-        } else {
-            None
-        }
+        })
     }
 
     fn get_board_from_idx(&self, idx: usize) -> Option<Board> {