get_wl_keyboard
Description:
Returns the Wayland `wl_keyboard` of a `GdkDevice`.
Parameters:
| this | a `GdkDevice` | 
Returns:
| a Wayland `wl_keyboard` | 
Returns the Wayland `wl_keyboard` of a `GdkDevice`.
| this | a `GdkDevice` | 
| a Wayland `wl_keyboard` |