virtual-keyboard overrides all keyboard layouts

[any1]

Steps to reproduce:

• Run sway with a wayland backend: WLR_BACKENDS=wayland sway
• Check keyboard layout in sway session: swaymsg -t get_inputs
• Run wayvnc inside the session or in another shell: WAYLAND_DISPLAY=wayland-1 wayvnc --keyboard=is
• Check the keyboard layout again and note that both "keyboards" now have the Icelandic layout.

This does not happen if smart grouping is turned off.

Looking at the debug log, I can see that the virtual keyboard always matches the group of the incumbent keyboard, which ought not happen with different layouts.

I have a theory that because virtual-keyboard sets the layout after it has created (and thus assigned to a group) the group's keyboard layout changes with the virtual keyboard's layout.

[emersion]

The virtual keyboard should definitely not be grouped with something else.

[any1]

I've been thinking about how to disable smart grouping specifically for virtual keyboards and there does not seem to be an obvious answer. Matching on "virtual_keyboard" inside sway/input/keyboard.c seems like a rather finicky solution. Perhaps there should be a special "vendor" set for virtual devices, and that can be used for matching?

[emersion]

Isn't it easy to detect keyboards created with the virtual-keyboard protocol?

[any1]

Never mind, there's a special event for it.