fix(bootstrap-data): always check flashes (#22659)

superset/views/base.py

@@ -388,13 +388,12 @@ def menu_data(user: User) -> Dict[str, Any]:
 
 
 @cache_manager.cache.memoize(timeout=60)
-def common_bootstrap_payload(user: User) -> Dict[str, Any]:
+def cached_common_bootstrap_data(user: User) -> Dict[str, Any]:
     """Common data always sent to the client
 
-    The function is memoized as the return value only changes based
-    on configuration and feature flag values.
+    The function is memoized as the return value only changes when user permissions
+    or configuration values change.
     """
-    messages = get_flashed_messages(with_categories=True)
     locale = str(get_locale())
 
     # should not expose API TOKEN to frontend
@@ -418,7 +417,6 @@ def common_bootstrap_payload(user: User) -> Dict[str, Any]:
     frontend_config["HAS_GSHEETS_INSTALLED"] = bool(available_specs[GSheetsEngineSpec])
 
     bootstrap_data = {
-        "flash_messages": messages,
         "conf": frontend_config,
         "locale": locale,
         "language_pack": get_language_pack(locale),
@@ -432,6 +430,13 @@ def common_bootstrap_payload(user: User) -> Dict[str, Any]:
     return bootstrap_data
 
 
+def common_bootstrap_payload(user: User) -> Dict[str, Any]:
+    return {
+        **(cached_common_bootstrap_data(user)),
+        "flash_messages": get_flashed_messages(with_categories=True),
+    }
+
+
 def get_error_level_from_status_code(  # pylint: disable=invalid-name
     status: int,
 ) -> ErrorLevel: