Fix shulker boxes (#57)

changelog/1.4.0+1.19.4.md

@@ -1,2 +1,3 @@
 * Add compacting drawer 
-* Add option to control whether drawer retain contents when broken
+* Add option to control whether drawer retain contents when broken
+* Fix shulker box weirdness

src/main/java/io/github/mattidragon/extendeddrawers/mixin/ShulkerBoxBlockEntityMixin.java

@@ -0,0 +1,20 @@
+package io.github.mattidragon.extendeddrawers.mixin;
+
+import io.github.mattidragon.extendeddrawers.item.DrawerItem;
+import net.minecraft.block.entity.ShulkerBoxBlockEntity;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.math.Direction;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(ShulkerBoxBlockEntity.class)
+public class ShulkerBoxBlockEntityMixin {
+    @Inject(method = "canInsert", at = @At("HEAD"), cancellable = true)
+    private void extended_drawers$fixShulkerBoxInsertion(int slot, ItemStack stack, Direction dir, CallbackInfoReturnable<Boolean> cir) {
+        if (stack.getItem() instanceof DrawerItem item && !item.canBeNested()) {
+            cir.setReturnValue(false);
+        }
+    }
+}

src/main/resources/extended_drawers.mixins.json

@@ -7,7 +7,8 @@
     "DataPackContentsMixin",
     "ItemStackMixin",
     "RecipeManagerMixin",
-    "ServerPlayerInteractionManagerMixin"
+    "ServerPlayerInteractionManagerMixin",
+    "ShulkerBoxBlockEntityMixin"
   ],
   "client": [
     "ClientPlayerInteractionManagerMixin"