Fix dryer's remaining time issue (#138764)

Fix dryer's remain_time issue

Co-authored-by: yunseon.park <yunseon.park@lge.com>

homeassistant/components/lg_thinq/sensor.py

@@ -581,36 +581,44 @@ class ThinQSensorEntity(ThinQEntity, SensorEntity):
             local_now = datetime.now(
                 tz=dt_util.get_time_zone(self.coordinator.hass.config.time_zone)
             )
-            if value in [0, None, time.min]:
-                # Reset to None
+            self._device_state = (
+                self.coordinator.data[self._device_state_id].value
+                if self._device_state_id in self.coordinator.data
+                else None
+            )
+            if value in [0, None, time.min] or (
+                self._device_state == "power_off"
+                and self.entity_description.key
+                in [TimerProperty.REMAIN, TimerProperty.TOTAL]
+            ):
+                # Reset to None when power_off
                 value = None
             elif self.entity_description.device_class == SensorDeviceClass.TIMESTAMP:
                 if self.entity_description.key in TIME_SENSOR_DESC:
-                    # Set timestamp for time
+                    # Set timestamp for absolute time
                     value = local_now.replace(hour=value.hour, minute=value.minute)
                 else:
                     # Set timestamp for delta
-                    new_state = (
-                        self.coordinator.data[self._device_state_id].value
-                        if self._device_state_id in self.coordinator.data
-                        else None
-                    )
-                    if (
-                        self.native_value is not None
-                        and self._device_state == new_state
-                    ):
-                        # Skip update when same state
-                        return
-
-                    self._device_state = new_state
-                    time_delta = timedelta(
+                    event_data = timedelta(
                         hours=value.hour, minutes=value.minute, seconds=value.second
                     )
-                    value = (
-                        (local_now - time_delta)
+                    new_time = (
+                        (local_now - event_data)
                         if self.entity_description.key == TimerProperty.RUNNING
-                        else (local_now + time_delta)
+                        else (local_now + event_data)
                     )
+                    # The remain_time may change during the wash/dry operation depending on various reasons.
+                    # If there is a diff of more than 60sec, the new timestamp is used
+                    if (
+                        parse_native_value := dt_util.parse_datetime(
+                            str(self.native_value)
+                        )
+                    ) is None or abs(new_time - parse_native_value) > timedelta(
+                        seconds=60
+                    ):
+                        value = new_time
+                    else:
+                        value = self.native_value
             elif self.entity_description.device_class == SensorDeviceClass.DURATION:
                 # Set duration
                 value = self._get_duration(