Fix modifiers support with backend != wayland

rootston/rootston.ini.example

@@ -24,3 +24,9 @@ geometry = 2500x800
 map-to-output = VGA-1
 # Restrict cursor movements for this mouse to concrete rectangle
 geometry = 2500x800
+
+# Keybindings
+# Maps key combinations with commands to execute
+# The special command "exit" stops the compositor
+[bindings]
+Logo+q=exit

types/wlr_keyboard.c

@@ -21,24 +21,41 @@ static void keyboard_led_update(struct wlr_keyboard *keyboard) {
 	wlr_keyboard_led_update(keyboard, leds);
 }
 
-void wlr_keyboard_update_state(struct wlr_keyboard *keyboard,
-		struct wlr_event_keyboard_key *event) {
-	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);
-	wl_signal_emit(&keyboard->events.key, event);
-}
-
 void wlr_keyboard_update_modifiers(struct wlr_keyboard *keyboard,
 		uint32_t mods_depressed, uint32_t mods_latched, uint32_t mods_locked,
 		uint32_t group) {
+	if (mods_depressed == keyboard->modifiers.depressed &&
+			mods_latched == keyboard->modifiers.latched &&
+			mods_locked == keyboard->modifiers.locked &&
+			group == keyboard->modifiers.group) {
+		return;
+	}
 	keyboard->modifiers.depressed = mods_depressed;
 	keyboard->modifiers.latched = mods_latched;
 	keyboard->modifiers.locked = mods_locked;
 	keyboard->modifiers.group = group;
 }
 
+void wlr_keyboard_update_state(struct wlr_keyboard *keyboard,
+		struct wlr_event_keyboard_key *event) {
+	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);
+
+	xkb_mod_mask_t depressed = xkb_state_serialize_mods(keyboard->xkb_state,
+		XKB_STATE_MODS_DEPRESSED);
+	xkb_mod_mask_t latched = xkb_state_serialize_mods(keyboard->xkb_state,
+		XKB_STATE_MODS_LATCHED);
+	xkb_mod_mask_t locked = xkb_state_serialize_mods(keyboard->xkb_state,
+		XKB_STATE_MODS_LOCKED);
+	xkb_mod_mask_t group = xkb_state_serialize_layout(keyboard->xkb_state,
+		XKB_STATE_LAYOUT_EFFECTIVE);
+	wlr_keyboard_update_modifiers(keyboard, depressed, latched, locked, group);
+
+	wl_signal_emit(&keyboard->events.key, event);
+}
+
 void wlr_keyboard_init(struct wlr_keyboard *kb,
 		struct wlr_keyboard_impl *impl) {
 	kb->impl = impl;

types/wlr_seat.c

@@ -402,28 +402,10 @@ static void keyboard_key_notify(struct wl_listener *listener, void *data) {
 		handle->seat_keyboard = seat_kb;
 	}
 
-	xkb_mod_mask_t depressed = xkb_state_serialize_mods(keyboard->xkb_state,
-		XKB_STATE_MODS_DEPRESSED);
-	xkb_mod_mask_t latched = xkb_state_serialize_mods(keyboard->xkb_state,
-		XKB_STATE_MODS_LATCHED);
-	xkb_mod_mask_t locked = xkb_state_serialize_mods(keyboard->xkb_state,
-		XKB_STATE_MODS_LOCKED);
-	xkb_mod_mask_t group = xkb_state_serialize_layout(keyboard->xkb_state,
-		XKB_STATE_LAYOUT_EFFECTIVE);
-	if (depressed != keyboard->modifiers.depressed ||
-			latched != keyboard->modifiers.latched ||
-			locked != keyboard->modifiers.locked ||
-			group != keyboard->modifiers.group) {
-		keyboard->modifiers.depressed = depressed;
-		keyboard->modifiers.latched = latched;
-		keyboard->modifiers.locked = locked;
-		keyboard->modifiers.group = group;
-
 	uint32_t modifiers_serial = wl_display_next_serial(seat->display);
-		wl_keyboard_send_modifiers(handle->keyboard, modifiers_serial, depressed,
-			latched, locked, group);
-	}
-
+	wl_keyboard_send_modifiers(handle->keyboard, modifiers_serial,
+		keyboard->modifiers.depressed, keyboard->modifiers.latched,
+		keyboard->modifiers.locked, keyboard->modifiers.group);
 	uint32_t key_serial = wl_display_next_serial(seat->display);
 	wl_keyboard_send_key(handle->keyboard, key_serial,
 		(uint32_t)event->time_usec, event->keycode, key_state);