#687: Add visibility and fixed API for ItemFrames

By: SydMontague <sydmontague@phoenix-staffel.de>

paper-server/nms-patches/EntityItemFrame.patch

@@ -1,5 +1,14 @@
 --- a/net/minecraft/server/EntityItemFrame.java
 +++ b/net/minecraft/server/EntityItemFrame.java
+@@ -11,7 +11,7 @@
+     private static final DataWatcherObject<ItemStack> ITEM = DataWatcher.a(EntityItemFrame.class, DataWatcherRegistry.g);
+     private static final DataWatcherObject<Integer> g = DataWatcher.a(EntityItemFrame.class, DataWatcherRegistry.b);
+     private float an = 1.0F;
+-    private boolean ao;
++    public boolean ao; // PAIL private -> public // PAIL rename isFixed
+ 
+     public EntityItemFrame(EntityTypes<? extends EntityItemFrame> entitytypes, World world) {
+         super(entitytypes, world);
 @@ -53,16 +53,27 @@
      @Override
      protected void updateBoundingBox() {

paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftItemFrame.java

@@ -128,6 +128,26 @@ public class CraftItemFrame extends CraftHanging implements ItemFrame {
         }
     }
 
+    @Override
+    public boolean isVisible() {
+        return !getHandle().isInvisible();
+    }
+
+    @Override
+    public void setVisible(boolean visible) {
+        getHandle().setInvisible(!visible);
+    }
+
+    @Override
+    public boolean isFixed() {
+        return getHandle().ao;
+    }
+
+    @Override
+    public void setFixed(boolean fixed) {
+        getHandle().ao = fixed;
+    }
+
     @Override
     public EntityItemFrame getHandle() {
         return (EntityItemFrame) entity;