Updated forge and added some more stuff from the new mappings.

gradle.properties

@@ -9,7 +9,7 @@ aebasename=appliedenergistics2
 #########################################################
 minecraft_version=1.11.2
 mcp_mappings=stable_32
-forge_version=13.20.0.2310
+forge_version=13.20.1.2388
 
 #########################################################
 # Installable                                           #

src/main/java/appeng/client/gui/Size1Slot.java

@@ -83,9 +83,9 @@ class Size1Slot extends Slot
 
 	@Override
 	@SideOnly( Side.CLIENT)
-	public boolean canBeHovered()
+	public boolean isEnabled()
 	{
-		return delegate.canBeHovered();
+		return delegate.isEnabled();
 	}
 
 	@Override

src/main/java/appeng/container/slot/AppEngSlot.java

@@ -141,9 +141,9 @@ public class AppEngSlot extends Slot
 	}
 
 	@Override
-	public boolean canBeHovered()
+	public boolean isEnabled()
 	{
-		return this.isEnabled();
+		return super.isEnabled();
 	}
 
 	public ItemStack getDisplayStack()
@@ -151,11 +151,6 @@ public class AppEngSlot extends Slot
 		return super.getStack();
 	}
 
-	public boolean isEnabled()
-	{
-		return true;
-	}
-
 	public float getOpacityOfIcon()
 	{
 		return 0.4f;