Fixes Blocks exit issue (#3600)

* fix

* changelog

* blocks

* formatting

CHANGELOG.md

@@ -10,6 +10,7 @@
 
 - Fixed bug where text for altair plots was not legible in dark mode by [@freddyaboulton](https://github.com/freddyaboulton) in [PR 3555](https://github.com/gradio-app/gradio/pull/3555)  
 - Fixes `Chatbot` and `Image` components so that files passed during processing are added to a directory where they can be served from, by [@abidlabs](https://github.com/abidlabs) in [PR 3523](https://github.com/gradio-app/gradio/pull/3523)
+- Fixes an an issue where if the Blocks scope was not exited, then State could be shared across sessions, by [@abidlabs](https://github.com/abidlabs) in [PR 3600](https://github.com/gradio-app/gradio/pull/3600)
 - Fixed bug where "or" was not being localized in file upload text by [@freddyaboulton](https://github.com/freddyaboulton) in [PR 3599](https://github.com/gradio-app/gradio/pull/3599)   
 
 ## Documentation Changes:

gradio/blocks.py

@@ -1149,6 +1149,7 @@ def __enter__(self):
             Context.root_block = self
         self.parent = Context.block
         Context.block = self
+        self.exited = False
         return self
 
     def __exit__(self, *args):
@@ -1163,6 +1164,7 @@ def __exit__(self, *args):
         self.config = self.get_config_file()
         self.app = routes.App.create_app(self)
         self.progress_tracking = any(block_fn.tracks_progress for block_fn in self.fns)
+        self.exited = True
 
     @class_or_instancemethod
     def load(
@@ -1384,6 +1386,9 @@ def reverse(text):
             demo = gr.Interface(reverse, "text", "text")
             demo.launch(share=True, auth=("username", "password"))
         """
+        if not self.exited:
+            self.__exit__()
+
         self.dev_mode = False
         if (
             auth

test/test_blocks.py

@@ -8,6 +8,7 @@
 import sys
 import time
 import unittest.mock as mock
+import uuid
 import warnings
 from contextlib import contextmanager
 from functools import partial
@@ -393,6 +394,12 @@ def test_use_default_theme_as_fallback(self, mock_from_hub):
             with gr.Blocks(theme="freddyaboulton/this-theme-does-not-exist") as demo:
                 assert demo.theme.to_dict() == gr.themes.Default().to_dict()
 
+    def test_exit_called_at_launch(self):
+        with gr.Blocks() as demo:
+            gr.Textbox(uuid.uuid4)
+        demo.launch(prevent_thread_lock=True)
+        assert len(demo.get_config_file()["dependencies"]) == 1
+
 
 class TestComponentsInBlocks:
     def test_slider_random_value_config(self):