> On Feb 19, 2018, at 3:48 AM, Gerd Hoffmann <kra...@redhat.com> wrote:
>  Hi,
>>> (b) Restrict allowed hotkeys to modifier key(s) plus one
>>>   non-modifier key.  Forwarding modifier keydown+keyup
>>>   to the guest has typically effects inside the guest,
>>>   so we only have to hold back that single non-modifier
>>>   key.  That is alot easier to implement.
>> Sorry but I was using this patch to make my ungrab key F15.
>> This key is not used by anything and makes things so simple
>> for me. Requiring a modifier key in the sequence seems unnecessary. 
> Just a plain F15 without any modifier should be find too.
> Allowing *two* (or more) non-modifier keys (i.e. F14+F15) is where it
> becomes tricky ...

I'm not sure I follow. The code does handle two or three non-modifier keys just 

A quick test shows this does work:
./ppc-softmmu/qemu-system-ppc -display cocoa,hotkey-grab=kp_4-kp_5-kp_6

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