Restore server-side playlist on reconnect (#567) (#590)

* Restore server-side playlist on reconnect (#567)

* Restore server-side playlist on reconnect (v2)

syncplay/client.py

@@ -1936,7 +1936,19 @@ def savePlaylistToFile(self, path):
             self._ui.showMessage("Playlist saved as {}".format(path)) # TODO: Move to messages_en
 
 
+    def playlistNeedsRestoring(self, files, username):
+        return self._client.sharedPlaylistIsEnabled() and self._playlist != None and files == [] and username == None and not self._playlistBufferIsFromOldRoom(self._client.userlist.currentUser.room)
+
+    def playlistNeedsRestoring(self, files, username):
+        return self._client.sharedPlaylistIsEnabled() and len(self._playlist) > 0 and not files and username == None and (self._previousPlaylistRoom == None or self._previousPlaylistRoom == self._client.userlist.currentUser.room)
+
     def changePlaylist(self, files, username=None, resetIndex=False):
+        if self.playlistNeedsRestoring(files, username):
+            self._ui.showDebugMessage("Restoring playlist on reconnect...")
+            files = self._playlist.copy()
+            self._client._protocol.setPlaylist(files)
+            self._client._protocol.setPlaylistIndex(self._playlistIndex)
+            return
         self.queuedIndexFilename = None
         if self._playlist == files:
             if self._playlistIndex != 0 and resetIndex: