Numpad "+", "-" and "/" not detected in IE/Edge

[mauro1855]

In IE /Edge, the "+", "-", "/" keys in the numpad are not detected even if you have a keybinding for these symbols. It only detects the "+", "-" and "/" not in the numpad.

This happens because the "key" property in the event is different in Chrome and IE.
In Chrome the key property is "+", "-" and "/", while in IE/Edge it returns "Add", "Subtract" and "Divide", respectively.

This difference in implementation was already handled for the "*", where IE/Edge return "Multiply".

Thanks,
Mauro

[mauro1855]

I noticed today the "Delete" button returns "delete" in Chrome, while in IE it always returns "Del". The fix for this is the same fix than the one for the original problem in this issue.
I'll update my pull request later.