keyboard: only update LEDs when changed

include/wlr/types/wlr_keyboard.h

@@ -62,6 +62,7 @@ struct wlr_keyboard {
 	xkb_led_index_t led_indexes[WLR_LED_COUNT];
 	xkb_mod_index_t mod_indexes[WLR_MODIFIER_COUNT];
 
+	uint32_t leds;
 	uint32_t keycodes[WLR_KEYBOARD_KEYS_CAP];
 	size_t num_keycodes;
 	struct wlr_keyboard_modifiers modifiers;

types/wlr_keyboard.c

@@ -163,6 +163,12 @@ void wlr_keyboard_finish(struct wlr_keyboard *kb) {
 }
 
 void wlr_keyboard_led_update(struct wlr_keyboard *kb, uint32_t leds) {
+	if (kb->leds == leds) {
+		return;
+	}
+
+	kb->leds = leds;
+
 	if (kb->impl && kb->impl->led_update) {
 		kb->impl->led_update(kb, leds);
 	}