swaylock: Fix caps lock not updating immediately

Partially fixes #2788. This change makes it so the lock screen is
redrawn whenever the caps lock modifier state changes, rather
on relying on the keypress event. This didn't work because
caps lock is disabled when the key is released, not pressed,
so the caps lock indicator does not go away until the next
keypress event.

swaylock/password.c

@@ -146,14 +146,6 @@ void swaylock_handle_key(struct swaylock_state *state,
 		schedule_indicator_clear(state);
 		break;
 	case XKB_KEY_Caps_Lock:
-		/* The state is getting active after this
-		 * so we need to manually toggle it */
-		state->xkb.caps_lock = !state->xkb.caps_lock;
-		state->auth_state = AUTH_STATE_INPUT_NOP;
-		damage_state(state);
-		schedule_indicator_clear(state);
-		schedule_password_clear(state);
-		break;
 	case XKB_KEY_Shift_L:
 	case XKB_KEY_Shift_R:
 	case XKB_KEY_Control_L:

swaylock/seat.c

@@ -63,8 +63,12 @@ static void keyboard_modifiers(void *data, struct wl_keyboard *wl_keyboard,
 	struct swaylock_state *state = data;
 	xkb_state_update_mask(state->xkb.state,
 		mods_depressed, mods_latched, mods_locked, 0, 0, group);
-	state->xkb.caps_lock = xkb_state_mod_name_is_active(state->xkb.state,
+	int caps_lock = xkb_state_mod_name_is_active(state->xkb.state,
 		XKB_MOD_NAME_CAPS, XKB_STATE_MODS_LOCKED);
+	if (caps_lock != state->xkb.caps_lock) {
+		state->xkb.caps_lock = caps_lock;
+		damage_state(state);
+	}
 	state->xkb.control = xkb_state_mod_name_is_active(state->xkb.state,
 		XKB_MOD_NAME_CTRL,
 		XKB_STATE_MODS_DEPRESSED | XKB_STATE_MODS_LATCHED);