Note that in the `sway_keyboard_configure` function of sway/input/keyboard.c,
we have skipped the `sway_keyboard_set_layout` function for virtual
keyboards, which then have null keymaps.
Hence, a null-safety check is needed at runtime.
The only reason it's included there is for a declaration of
struct sway_server, but we can just forward-declare it.
This avoids rebuilding almost all of Sway when touching server.h.
All other server.h includes are from source files, not headers.
JingMatrix
Simon Ser
Victor Makarov
Simon Zeni
Bor Grošelj Simić
Brian Ashworth