Handle large chests correctly for hopper events. Fixes BUKKIT-3979

In commit 7710efc5f9 we corrected the handling of large chests as the
destination for hoppers moving items but did not apply the same fix for
large chests being the source or for droppers. This commit updates these
to have the same fix.

src/main/java/net/minecraft/server/BlockDropper.java

@@ -40,7 +40,14 @@ public class BlockDropper extends BlockDispenser {
                     // CraftBukkit start - Fire event when pushing items into other inventories
                     CraftItemStack oitemstack = CraftItemStack.asCraftMirror(itemstack.cloneItemStack().a(1));
 
-                    org.bukkit.inventory.Inventory destinationInventory = iinventory.getOwner() != null ? iinventory.getOwner().getInventory() : null;
+                    org.bukkit.inventory.Inventory destinationInventory;
+                    // Have to special case large chests as they work oddly
+                    if (iinventory instanceof InventoryLargeChest) {
+                        destinationInventory = new org.bukkit.craftbukkit.inventory.CraftInventoryDoubleChest((InventoryLargeChest) iinventory);
+                    } else {
+                        destinationInventory = iinventory.getOwner().getInventory();
+                    }
+
                     InventoryMoveItemEvent event = new InventoryMoveItemEvent(tileentitydispenser.getOwner().getInventory(), oitemstack.clone(), destinationInventory, true);
                     world.getServer().getPluginManager().callEvent(event);
                     if (event.isCancelled()) {

src/main/java/net/minecraft/server/TileEntityHopper.java

@@ -283,7 +283,14 @@ public class TileEntityHopper extends TileEntity implements IHopper {
             // CraftBukkit start - Call event on collection of items from inventories into the hopper
             CraftItemStack oitemstack = CraftItemStack.asCraftMirror(iinventory.splitStack(i, 1));
 
-            Inventory sourceInventory = iinventory.getOwner() != null ? iinventory.getOwner().getInventory() : null;
+            Inventory sourceInventory;
+            // Have to special case large chests as they work oddly
+            if (iinventory instanceof InventoryLargeChest) {
+                sourceInventory = new org.bukkit.craftbukkit.inventory.CraftInventoryDoubleChest((InventoryLargeChest) iinventory);
+            } else {
+                sourceInventory = iinventory.getOwner().getInventory();
+            }
+
             InventoryMoveItemEvent event = new InventoryMoveItemEvent(sourceInventory, oitemstack.clone(), ihopper.getOwner().getInventory(), false);
 
             ihopper.getWorld().getServer().getPluginManager().callEvent(event);