Fixed drawer controllers not working with external storage

src/main/java/refinedstorage/block/BlockExternalStorage.java

@@ -37,7 +37,7 @@ public class BlockExternalStorage extends BlockSlave {
         super.neighborChanged(state, world, pos, block);
 
         if (!world.isRemote) {
-            ((TileExternalStorage) world.getTileEntity(pos)).refreshStorage();
+            ((TileExternalStorage) world.getTileEntity(pos)).updateStorage();
         }
     }
 

src/main/java/refinedstorage/tile/externalstorage/TileExternalStorage.java

@@ -40,6 +40,7 @@ public class TileExternalStorage extends TileSlave implements IStorageProvider,
     private int capacity;
 
     private List<ExternalStorage> storages = new ArrayList<ExternalStorage>();
+    private int lastDrawerCount;
 
     @Override
     public int getEnergyUsage() {
@@ -50,6 +51,17 @@ public class TileExternalStorage extends TileSlave implements IStorageProvider,
     public void updateSlave() {
     }
 
+    @Override
+    public void update() {
+        super.update();
+
+        if (getFacingTile() instanceof IDrawerGroup && lastDrawerCount != ((IDrawerGroup) getFacingTile()).getDrawerCount()) {
+            lastDrawerCount = ((IDrawerGroup) getFacingTile()).getDrawerCount();
+
+            updateStorage();
+        }
+    }
+
     @Override
     public void writeContainerData(ByteBuf buf) {
         super.writeContainerData(buf);
@@ -144,8 +156,8 @@ public class TileExternalStorage extends TileSlave implements IStorageProvider,
         markDirty();
     }
 
-    // Called when the neighbor block changes
-    public void refreshStorage() {
+    // Called when the neighbor block changes or when a drawer is added or removed to a drawer group
+    public void updateStorage() {
         storages.clear();
 
         TileEntity facing = getFacingTile();