You can now re-insert a Pattern in the pattern output slot in the Pattern Grid to modify an existing pattern

CHANGELOG.md

@@ -3,6 +3,7 @@
 ### 1.5.22
 - Added oredict, blocking, processing, ore inputs access to OpenComputers API (raoulvdberge)
 - The Crafter can now only store 1 stack size pattern per slot (raoulvdberge)
+- You can now re-insert a Pattern in the pattern output slot in the Pattern Grid to modify an existing pattern (raoulvdberge)
 - Fixed not being able to use JEI R and U keys on Grid with tabs (raoulvdberge)
 
 ### 1.5.21

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/network/node/NetworkNodeGrid.java

@@ -39,7 +39,6 @@ import net.minecraftforge.items.ItemHandlerHelper;
 import net.minecraftforge.items.wrapper.CombinedInvWrapper;
 import net.minecraftforge.items.wrapper.InvWrapper;
 
-import javax.annotation.Nonnull;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -74,10 +73,20 @@ public class NetworkNodeGrid extends NetworkNode implements IGrid {
     private ItemHandlerBase matrixProcessing = new ItemHandlerBase(9 * 2, new ItemHandlerListenerNetworkNode(this));
 
     private ItemHandlerBase patterns = new ItemHandlerBase(2, new ItemHandlerListenerNetworkNode(this), new ItemValidatorBasic(RSItems.PATTERN)) {
-        @Nonnull
         @Override
-        public ItemStack insertItem(int slot, @Nonnull ItemStack stack, boolean simulate) {
-            return slot == 0 ? super.insertItem(slot, stack, simulate) : stack;
+        protected void onContentsChanged(int slot) {
+            super.onContentsChanged(slot);
+
+            if (slot == 1 && !processingPattern && !getStackInSlot(slot).isEmpty()) {
+                for (int i = 0; i < 9; ++i) {
+                    matrix.setInventorySlotContents(i, StackUtils.nullToEmpty(ItemPattern.getSlot(getStackInSlot(slot), i)));
+                }
+            }
+        }
+
+        @Override
+        public int getSlotLimit(int slot) {
+            return slot == 1 ? 1 : super.getSlotLimit(slot);
         }
     };
     private List<IFilter> filters = new ArrayList<>();

src/main/java/com/raoulvdberge/refinedstorage/container/ContainerGrid.java

@@ -61,7 +61,7 @@ public class ContainerGrid extends ContainerBase {
 
         if (grid.getType() == GridType.PATTERN) {
             addSlotToContainer(new SlotItemHandler(((NetworkNodeGrid) grid).getPatterns(), 0, 172, headerAndSlots + 4));
-            addSlotToContainer(new SlotOutput(((NetworkNodeGrid) grid).getPatterns(), 1, 172, headerAndSlots + 40));
+            addSlotToContainer(new SlotItemHandler(((NetworkNodeGrid) grid).getPatterns(), 1, 172, headerAndSlots + 40));
         }
 
         if (grid instanceof IPortableGrid) {

src/main/java/com/raoulvdberge/refinedstorage/item/ItemPattern.java

@@ -88,6 +88,7 @@ public class ItemPattern extends ItemBase implements ICraftingPatternProvider {
         pattern.getTagCompound().setTag(String.format(NBT_SLOT, slot), stack.serializeNBT());
     }
 
+    @Nullable
     public static ItemStack getSlot(ItemStack pattern, int slot) {
         String id = String.format(NBT_SLOT, slot);