When typing in the Search field to filter recipes in an inventory screen, pressing Enter removes the cursor focus from the input control. This allows mouseover hotkeys (like using U for an item's use) to resume functioning after filtering recipes. This doesn't occur when pressing the Numpad Enter key instead.

Context: I often type a left-handed letter partial name into the Search field and want to use my right thumb to hit the Numpad Enter key. This way I can find the recipe for things without removing my hand from either the mouse or the WSAD area of the keyboard.

This is a good idea, I'll have to look through and see if I hardcode this anywhere and fix it.