fix a bug introduced in `855d08d4`

pywebio/__version__.py

@@ -1,8 +1,8 @@
 __package__ = 'pywebio'
 __description__ = 'Write interactive web app in script way.'
 __url__ = 'https://pywebio.readthedocs.io'
-__version__ = "1.3.0"
-__version_info__ = (1, 3, 0, 0)
+__version__ = "1.3.1"
+__version_info__ = (1, 3, 1, 0)
 __author__ = 'WangWeimin'
 __author_email__ = 'wang0.618@qq.com'
 __license__ = 'MIT'

pywebio/output.py

@@ -923,7 +923,7 @@ def put_loading(shape='border', color='dark', scope=Scope.Current, position=Outp
     dom_id = random_str(10)
 
     def enter(self):
-        self.spec['container_dom_id'] = dom_id
+        self.spec['container_dom_id'] = scope2dom(dom_id, no_css_selector=True)
         self.send()
         return dom_id