I have my pick block key mapped to "r", and tried to middle click and drag to fill up slots with stacks of blocks, and discovered it did not work. I changed my pick block key back to default (middle click) and it worked.
How to reproduce:
1. Go to Options -> Controls -> Key Binds -> Pick Block and set it to a key
2. Go into a creative world, and pick up a block in your inventory
3. Middle click and drag in empty spots in your inventory
Expected result:
Your inventory gets filled with blocks
What happened:
Your inventory does not get filled with blocks
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