fix: ignore plate display slots when deciding whether food remains

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Author: XxFran10xX

src/main/java/net/tfminecraft/cooking/manager/PlateManager.java

@@ -112,11 +112,17 @@ public boolean hasSauce(Furniture f) {
      */
     boolean hasLeftoverSauce(Furniture f, String leavingSlot) {
         if(!f.hasActiveSlot("sauce")) return false;
+        return !hasFood(f, leavingSlot);
+    }
+
+    // An active food slot counts even without a loaded item: restore can leave the item unset
+    // while the display still shows the food.
+    private boolean hasFood(Furniture f, String ignoredSlot) {
         for(String id : f.getActiveSlots().keySet()) {
-            if(id.equals("sauce") || id.equals(leavingSlot)) continue;
-            return false;
+            if(id.equals("sauce") || id.contains("display") || id.equals(ignoredSlot)) continue;
+            return true;
         }
-        return true;
+        return false;
     }
 
     @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
@@ -134,7 +140,7 @@ public void takeItem(FurnitureSlotItemTakeEvent e) {
     public void addSauce(Player p, Furniture f, FoodItem sauce, ItemStack base) {
         if (hasSauce(f)) return;
         // Sauce on an empty plate would never reach food added later, so keep the ladle full.
-        if (f.getActiveSlots().isEmpty()) return;
+        if (!hasFood(f, null)) return;
 
         // Replace player ladle with empty ladle
         p.getInventory().setItemInMainHand(

src/test/java/net/tfminecraft/cooking/manager/PlateManagerTest.java

@@ -157,4 +157,21 @@ void sauceOnAnEmptyPlateReturnsBeforeTouchingThePlayerOrLadle() {
         assertDoesNotThrow(() -> new PlateManager().addSauce(null, plate, null, null));
         assertTrue(plate.getActiveSlots().isEmpty());
     }
+
+    @Test
+    void displaySlotsDoNotCountAsFood() {
+        Furniture plate = plateWithSauceVisual();
+        plate.getActiveSlots().put("display_1", new PlacedSlot(plate, "display_1"));
+
+        assertTrue(new PlateManager().hasLeftoverSauce(plate, null));
+    }
+
+    @Test
+    void sauceOnADisplayOnlyPlateReturnsBeforeTouchingThePlayerOrLadle() {
+        Furniture plate = new Furniture("plate", null, UUID.randomUUID());
+        plate.getActiveSlots().put("display_1", new PlacedSlot(plate, "display_1"));
+
+        assertDoesNotThrow(() -> new PlateManager().addSauce(null, plate, null, null));
+        assertFalse(plate.hasActiveSlot("sauce"));
+    }
 }