Restore the +/- numpad default behaviour (increase/decrease viewing range)

[Zughy]

Problem

It's not possible to use +/- on the numpad anymore to increase/decrease the viewing range, since some 5.8.0-dev commit

Solutions

Restore such behaviour

Alternatives

Issue forms are kinda annoying

Additional context

No response

[grorp]

As stated on IRC, this is caused by #13773.

"Numpad Plus" and "Plus" are now considered two different keys, and "Increase Viewing Range" is still bound to "Plus" by default
I'm not sure what can be done about this problem. I don't think that PR should simply be reverted, it's useful to be able to bind e.g. "1" and "Numpad 1" to different actions.

rubenwardy's suggestion:

Should be bound to both keys by default then

https://irc.minetest.net/minetest-dev/2023-10-11#i_6121252

[erlehmann]

@grorp say, is #13773 also causing #13899 maybe?

(If it does, my suggestion would be to revert that thing instead of binding more keys.)

[erlehmann]

I have confirmed that reverting the change from #13773 also fixes the regression where I can not input a + at all because it needs a modifier key on my layout: #13899 (comment)

I think commit d57c936 should be reverted due to causing multiple regressions.

The idea is simply not very good if it results in users of layouts where “+” needs a modifier key to not be able to use a “+” at all.

[grorp]

Fixed by #13942.