初始化 xkb 扩展

src/wm.h

@@ -2,6 +2,7 @@
 
 #include <stdint.h>
 #include <xcb/xcb_keysyms.h>
+#include <xkbcommon/xkbcommon.h>
 
 #include "types.h"
 
@@ -25,6 +26,13 @@ typedef struct wm_t {
   bool have_xfixes;
   bool have_xinerama;
   bool have_randr;
+  bool have_xkb;
+
+  uint8_t event_base_xkb;
+  bool xkb_reload_keymap;
+  bool xkb_update_pending;
+  struct xkb_context *xkb_ctx;
+  struct xkb_state *xkb_state;
 
   color_set_t color_set;
 } wm_t;