No incrementing is involved. Just a bug in the parser that tries to determine when a + is for a combination, and when it is for the actual key.
https://github.com/mootools/mootools-more/issues
- [Moo] Keyboard issue: 'shift++' combination firing on any... davepilbeam
- Re: [Moo] Keyboard issue: 'shift++' combination firin... Philip Thompson
- Re: [Moo] Keyboard issue: 'shift++' combination f... Sean McArthur
