When select is the hotkey, can't add coin in some games

[digitalLumberjack]

Hi,
thank you for the great work.

I found a little bug in the core :

When you have the same button for hotkey and select in your config, the select button doesn't add coin in some games (many are old games, pacman, miss pacman, gauntlet 1 and 2) etc...
I tried to look at the code but i don't know where to begin, do you have an hint ?

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