Clicking into the first 7 inventory slots cancels smelting recipe preview

To reproduce:

1. /recipe give @p *
2. /clear
3. /setblock ~ ~ ~ furnace
4. Open the furnace
5. (Open the recipe book)
6. Click a recipe
7. Click the top-left inventory slot
8. Observe the recipe preview disappear

This is because the number of inventory slots with which interaction cancels the recipe preview uses the number of slots appropriate for a crafting bench, 10.