Issue description:

You can duplicate any stackable item you have with a pattern grid

What happens:

if the grid is in processing mode and you put items into input or output, double-clicking with a stackable item of the same type will take items out of the pattern grid slots and into the hand of the user

What you expected to happen:

either the items in the grid disappear or they stay where they are instead

Steps to reproduce:

1. Place down a pattern grid, connected or disconnected from a system.
2. Put the grid in processing mode
3. Put any stackable item into one of the open slots
4. In your actual inventory, double-click on the same type of item to see it take items from the pattern grid and fill it up to a stack
   ...

Version (make sure you are on the latest version before reporting):

• Minecraft: 1.12.2
• Forge: 14.23.4.2760
• Refined Storage: 1.6.4

Does this issue occur on a server? yes

If a (crash)log is relevant for this issue, link it here:

[pastebin/gist/etc link here]

"(make sure you are on the latest version before reporting):"

Can you reproduce this on 1.6.8?