Use xkb_state_update_mask() with Wayland backend

Fix #158

backend/libinput/keyboard.c

@@ -67,5 +67,6 @@ void handle_keyboard_key(struct libinput_event *event,
 		wlr_event.state = WLR_KEY_PRESSED;
 		break;
 	}
-	wlr_keyboard_update_state(wlr_dev->keyboard, &wlr_event);
+	wlr_event.update_state = true;
+	wlr_keyboard_notify_key(wlr_dev->keyboard, &wlr_event);
 }

backend/wayland/wl_seat.c

@@ -149,13 +149,16 @@ static void keyboard_handle_key(void *data, struct wl_keyboard *wl_keyboard,
 	wlr_event.state = state;
 	wlr_event.time_sec = time / 1000;
 	wlr_event.time_usec = time * 1000;
-	wlr_keyboard_update_state(dev->keyboard, &wlr_event);
+	wlr_keyboard_notify_key(dev->keyboard, &wlr_event);
 }
 
 static void keyboard_handle_modifiers(void *data, struct wl_keyboard *wl_keyboard,
 		uint32_t serial, uint32_t mods_depressed, uint32_t mods_latched,
 		uint32_t mods_locked, uint32_t group) {
-
+	struct wlr_input_device *dev = data;
+	assert(dev && dev->keyboard);
+	wlr_keyboard_notify_modifiers(dev->keyboard, mods_depressed, mods_latched,
+		mods_locked, group);
 }
 
 static void keyboard_handle_repeat_info(void *data, struct wl_keyboard *wl_keyboard,

backend/x11/backend.c

@@ -51,9 +51,11 @@ static bool handle_x11_event(struct wlr_x11_backend *x11, xcb_generic_event_t *e
 			.keycode = ev->detail - 8,
 			.state = event->response_type == XCB_KEY_PRESS ?
 				WLR_KEY_PRESSED : WLR_KEY_RELEASED,
+			.update_state = true,
 		};
 
-		wl_signal_emit(&x11->keyboard.events.key, &key);
+		// TODO use xcb-xkb for more precise modifiers state?
+		wlr_keyboard_notify_key(&x11->keyboard, &key);
 		x11->time = ev->time;
 		break;
 	}

include/wlr/interfaces/wlr_keyboard.h

@@ -11,7 +11,10 @@ struct wlr_keyboard_impl {
 
 void wlr_keyboard_init(struct wlr_keyboard *keyboard, struct wlr_keyboard_impl *impl);
 void wlr_keyboard_destroy(struct wlr_keyboard *keyboard);
-void wlr_keyboard_update_state(struct wlr_keyboard *keyboard,
+void wlr_keyboard_notify_key(struct wlr_keyboard *keyboard,
 		struct wlr_event_keyboard_key *event);
+void wlr_keyboard_notify_modifiers(struct wlr_keyboard *keyboard,
+		uint32_t mods_depressed, uint32_t mods_latched, uint32_t mods_locked,
+		uint32_t group);
 
 #endif

include/wlr/types/wlr_keyboard.h

@@ -65,6 +65,7 @@ struct wlr_event_keyboard_key {
 	uint32_t time_sec;
 	uint64_t time_usec;
 	uint32_t keycode;
+	bool update_state;
 	enum wlr_key_state state;
 };
 

types/wlr_keyboard.c

@@ -45,11 +45,21 @@ static void keyboard_modifier_update(struct wlr_keyboard *keyboard) {
 	wl_signal_emit(&keyboard->events.modifiers, keyboard);
 }
 
-void wlr_keyboard_update_state(struct wlr_keyboard *keyboard,
+void wlr_keyboard_notify_modifiers(struct wlr_keyboard *keyboard,
+		uint32_t mods_depressed, uint32_t mods_latched, uint32_t mods_locked,
+		uint32_t group) {
+	xkb_state_update_mask(keyboard->xkb_state, mods_depressed, mods_latched,
+		mods_locked, 0, 0, group);
+	keyboard_modifier_update(keyboard);
+}
+
+void wlr_keyboard_notify_key(struct wlr_keyboard *keyboard,
 		struct wlr_event_keyboard_key *event) {
+	if (event->update_state) {
 		uint32_t keycode = event->keycode + 8;
 		xkb_state_update_key(keyboard->xkb_state, keycode,
 			event->state == WLR_KEY_PRESSED ? XKB_KEY_DOWN : XKB_KEY_UP);
+	}
 	keyboard_led_update(keyboard);
 	keyboard_modifier_update(keyboard);
 	wl_signal_emit(&keyboard->events.key, event);