Merge pull request #2426 from plotly/fix-2418

Set default interval to 1 second for app.long_callback

Author: T4rk1n

CHANGELOG.md

@@ -15,17 +15,13 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 - [#2417](https://github.com/plotly/dash/pull/2417) Disable the pytest plugin if `dash[testing]` not installed, fix [#946](https://github.com/plotly/dash/issues/946).
 - [#2417](https://github.com/plotly/dash/pull/2417) Do not swallow the original error to get the webdriver, easier to know what is wrong after updating the browser but the driver.
 - [#2425](https://github.com/plotly/dash/pull/2425) Fix multiple log handler added unconditionally to the logger, resulting in duplicate log message.
+- [#2415](https://github.com/plotly/dash/pull/2415) Fix background callbacks progress not deleted after fetch.
+- [#2426](https://github.com/plotly/dash/pull/2426) Set default interval to 1 second for app.long_callback, restoring the behavior it had before v2.6.0 when we introduced `backround=True` callbacks.
 
 ## Changed
 
 - [#2425](https://github.com/plotly/dash/pull/2425) Moved the logger namespace to `dash.dash`, as library logger it should be on that namespace instead of the user app.
 
-## [UNRELEASED]
-
-## Fixed
-
-- [#2415](https://github.com/plotly/dash/pull/2415) Fix background callbacks progress not deleted after fetch.
-
 ## [2.8.1] - 2023-01-30
 
 ## Fixed

dash/dash.py

@@ -1162,7 +1162,7 @@ def long_callback(
         self,
         *_args,
         manager=None,
-        interval=None,
+        interval=1000,
         running=None,
         cancel=None,
         progress=None,