Ignore AltGr option or filter

[MadLittleMods]

I am not a native user of a keyboard layout that has AltGr so forgive my ignorance. AltGr is a special key in the browser that registers two key events for CtrlLeft and AltRight. It is used to get to the symbols under the numbers that English users would normally use Shift for. !@#$%^&*()

This is especially painful if you want to bind Ctrl + Alt + [0-9] which works great work on English layouts but completely clobbers users with AltGr.

Many ways to implement in keymaster: A new mode like key.noAltgr() wouldn't fire events if we suspected the AltGr key to be pushed. Could be an extra string bit to add onto the hooks ctrl+alt+1-altgr, note the -altgr. Or could be a new option to key.filter(e, isAltgr)

This wouldn't be bullet proof as the only way I know how to detect AltGr is looking at the location property on the KeyboardEvent for the Ctrl and Alt keys; which doesn't account for someone actually pressing the left control and right alt (seems like a odd use case vs obliterating the whole userbase with AltGr though)

AltGr fires the following events:

• Ctrl: { code: 'ControlLeft', location: 1, ... }
• Alt: { code: 'AltRight', location: 2, ... }

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As a note, we saw this mainly with AZERTY and Swedish layouts which have the AltGr key.