have a fixed order/sorting for hotkeys

[Soroosh Azary Marhabi]

hi

i use letter-based hotkeys to open recent files, and i like to have the hotkeys in a consistent order every time. for example every time i open nvim i want to push a to open most recent file, s to open 2nd file, ...

currently it generates them randomly and each time i have to check which hotkey i want. but if it was consistent it would've been faster for me.

i know that number-based hotkeys are sorted & consistent but because of the count of items, it forces me to push 2 keys, and i'm really lazy :)

currently using latest master commit at 354e7bd on nvim v0.10.0-dev-2682+g011585f35

thanks