on logout clear all settings and internal state

OsmAnd-telegram/src/net/osmand/telegram/TelegramSettings.kt

@@ -162,6 +162,13 @@ class TelegramSettings(private val app: TelegramApplication) {
 
 	fun getShowOnMapChatsCount() = showOnMapChats.size
 
+	fun clear() {
+		stopSharingLocationToChats()
+		val prefs = app.getSharedPreferences(SETTINGS_NAME, Context.MODE_PRIVATE)
+		val edit = prefs.edit()
+		edit.clear().apply()
+	}
+	
 	fun save() {
 		val prefs = app.getSharedPreferences(SETTINGS_NAME, Context.MODE_PRIVATE)
 		val edit = prefs.edit()

OsmAnd-telegram/src/net/osmand/telegram/helpers/MessagesDbHelper.kt

@@ -35,11 +35,15 @@ class MessagesDbHelper(val app: TelegramApplication) {
 	}
 
 	fun saveMessages() {
-		sqliteHelper.clearMessages()
+		clearMessages()
 		synchronized(messages) {
 			sqliteHelper.addMessages(messages)
 		}
 	}
+	
+	fun clearMessages() {
+		sqliteHelper.clearMessages()
+	}
 
 	private fun addMessage(chatId: Long, messageId: Long) {
 		synchronized(messages) {

OsmAnd-telegram/src/net/osmand/telegram/ui/MainActivity.kt

@@ -271,6 +271,8 @@ class MainActivity : AppCompatActivity(), TelegramListener, ActionButtonsListene
 	fun logoutTelegram(silent: Boolean = false) {
 		if (telegramHelper.getTelegramAuthorizationState() == TelegramHelper.TelegramAuthorizationState.READY) {
 			if (app.isInternetConnectionAvailable) {
+				app.messagesDbHelper.clearMessages()
+				settings.clear()
 				telegramHelper.logout()
 			} else {
 				Toast.makeText(this, R.string.logout_no_internet_msg, Toast.LENGTH_SHORT).show()