Fix Carpenter output Dupe bug

application.properties

@@ -2,4 +2,4 @@ mcversion=1.7.10
 forgeversion=10.13.3.1370-1.7.10
 version_major=3
 version_minor=6
-version_patch=8
+version_patch=9

src/main/java/forestry/core/inventory/InvTools.java

@@ -1102,12 +1102,14 @@ public abstract class InvTools {
 	}
 
 	public static boolean tryAddStack(IInventory inventory, ItemStack stack, int startSlot, int slots, boolean all, boolean doAdd) {
-		int added = addStack(inventory, stack, startSlot, slots, doAdd);
-		if (all) {
-			return added == stack.stackSize;
-		} else {
-			return added > 0;
+		int added = addStack(inventory, stack, startSlot, slots, false);
+		boolean success = all ? (added == stack.stackSize) : (added > 0);
+
+		if (success	&& doAdd) {
+			addStack(inventory, stack, startSlot, slots, true);
 		}
+
+		return success;
 	}
 
 	public static int addStack(IInventory inventory, ItemStack stack, boolean doAdd) {