only update if all is in the url

Author: Hellowlol

plexapi/library.py

@@ -378,7 +378,9 @@ def fetchItems(self, ekey, cls=None, **kwargs):
             raise BadRequest('ekey was not provided')
         data = self._server.query(ekey, params=url_kw)
 
-        self._total_size = utils.cast(int, data.attrib.get("totalSize"))
+        if '/all' in ekey:
+            self._total_size = utils.cast(int, data.attrib.get("totalSize"))
+
         items = self.findItems(data, cls, ekey, **kwargs)
 
         librarySectionID = data.attrib.get('librarySectionID')