Fix SmithingInventory helper slot methods for 1.20 (#9325)

patches/api/Add-item-slot-convenience-methods.patch

@@ -188,41 +188,56 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +    // Paper start
 +    /**
-+     * Gets the input equipment (first slot).
++     * Gets the input template (first slot).
 +     *
-+     * @return input equipment item
++     * @return input template item
 +     */
-+    @Nullable
++    default @Nullable ItemStack getInputTemplate() {
-+    default ItemStack getInputEquipment() {
++        return this.getItem(0);
-+        return getItem(0);
 +    }
 +
 +    /**
-+     * Sets the input equipment (first slot).
++     * Sets the input template (first slot).
++     *
++     * @param itemStack item to set
++     */
++    default void setInputTemplate(@Nullable ItemStack itemStack) {
++        this.setItem(0, itemStack);
++    }
++    /**
++     * Gets the input equipment (second slot).
++     *
++     * @return input equipment item
++     */
++    default @Nullable ItemStack getInputEquipment() {
++        return this.getItem(1);
++    }
++
++    /**
++     * Sets the input equipment (second slot).
 +     *
 +     * @param itemStack item to set
 +     */
 +    default void setInputEquipment(@Nullable ItemStack itemStack) {
-+        setItem(0, itemStack);
++        this.setItem(1, itemStack);
 +    }
 +
 +    /**
-+     * Gets the input mineral (second slot).
++     * Gets the input mineral (third slot).
 +     *
 +     * @return input mineral item
 +     */
-+    @Nullable
++    default @Nullable ItemStack getInputMineral() {
-+    default ItemStack getInputMineral() {
++        return this.getItem(2);
-+        return getItem(1);
 +    }
 +
 +    /**
-+     * Sets the input mineral (second slot).
++     * Sets the input mineral (third slot).
 +     *
 +     * @param itemStack item to set
 +     */
 +    default void setInputMineral(@Nullable ItemStack itemStack) {
-+        setItem(1, itemStack);
++        this.setItem(2, itemStack);
 +    }
 +    // Paper end
  }