[PATCH] Introduce keyboard grabbing protocol

[Yong Bakos]

Hi,

> On Dec 1, 2016, at 3:07 AM, Olivier Fourdan <ofourdan at redhat.com> wrote:
> 
> Hey,
> 
> ----- Original Message -----
>> On 30 August 2016 at 14:05, Olivier Fourdan <ofourdan at redhat.com> wrote:
>>>> Xwayland should probably use a private protocol, like EGL, ideally
>>>> completely hidden and pid-restricted.
>>> 
>>> That's the point, I initially thought of a private protocol, but then
>>> realized it could be useful outside of the Xwayland use case as well.
>>> 
>>> If not, I'd be happy to drop this patch and return to the private approach
>>> :)
>>> 
>>> Speaking of which, that was the idea behind those patches:
>>> 
>>> https://patchwork.freedesktop.org/patch/105319/
>>> https://patchwork.freedesktop.org/patch/103815/
>>> https://patchwork.freedesktop.org/patch/105421/
>> 
>> Hmmmm. I really, desperately, want to avoid keyboard grabs as much as
>> possible. But I guess Alt-Tab in a VM is the one usecase which can't
>> route around this. Out of interest, do you know if that works on
>> VMWare/VirtualBox/etc on OS X and Windows? If they don't, then we
>> don't have to either, and we can just make this private to XWayland.
>> If they do, then I guess we probably need to follow suit as well.
> 
> According to VMWare docs available online, it has this feature on Windows, it uses a special key combo to release the mouse and keyboard input when needed.
> 
> And according to Virtualbox manual, Virtualbox has that too: https://www.virtualbox.org/manual/ch01.html#keyb_mouse_normal

FWIW, just chiming in to assert that this is true on all platforms. For
example, punching ctrl-super (command) from within the guest vm will
release input control to the host.

yong


> 
>> If we do though, I'd prefer to see two protocols: one for native
>> clients which demands a matching wl_seat serial, and another for
>> XWayland which doesn't have that restriction.
> 
> This has an additional benefit, we can work on a "private" protocol for Xwayland (to keep backward compatibility with existing X11 applications) and decide later to do the same for native clients, if needed.
> 
>> Note that this is basically just about the concept; I haven't looked
>> at the exact detail of the wording yet.
> 
> Cheers,
> Olivier
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