Question: what means [quicktune]Selected "(nothing)"

[rubberduck]

when i press the 1 or 7 (numpad only), minetest says me: [quicktune]Selected "(nothing)"

what does this mean and what is this for?

when i press 9 or 3 it says: [quicktune] "(nothing)" = (none).

(i use arrowkeys for controlling and sometimes i press the 1 which is next to the up-key in my case)

[sloantothebone]

I'm necroposting here, but could somebody answer this question please?

[Sokomine]

You can select an item to wield from your topmost inventory row by using the scroll wheel of your mouse - or by typing a number between 1 and 7. The message shown may be debug info related to that.

[srifqi]

But, why it happens if I press PageUp and PageDown?

[Sokomine]

But, why it happens if I press PageUp and PageDown?

Guess that's because they're part of the number block on the keyboard? Someone forgot to remove a debugging option. If it bothers you, file an issue on GitHub :-)