Preload config flow if it exists when loading a component (#112145)

Since config_entries always requires the config_flow to be loaded
to check for migrations, load it if we know it exists when loading
the underlying integration

homeassistant/loader.py

@@ -908,6 +908,15 @@ class Integration:
             with suppress(ImportError):
                 self.get_platform("config")
 
+        if self.config_flow:
+            # If there is a config flow, we will cache it as well since
+            # config entry setup always has to load the flow to get the
+            # major/minor version for migrations. Since we may be running
+            # in the executor we will use this opportunity to cache the
+            # config_flow as well.
+            with suppress(ImportError):
+                self.get_platform("config_flow")
+
         return cache[self.domain]
 
     async def async_get_platform(self, platform_name: str) -> ModuleType:

tests/test_loader.py

@@ -1038,10 +1038,10 @@ async def test_hass_components_use_reported(
         ) in caplog.text
 
 
-async def test_async_get_component_preloads_config(
+async def test_async_get_component_preloads_config_and_config_flow(
     hass: HomeAssistant, caplog: pytest.LogCaptureFixture
 ) -> None:
-    """Verify async_get_component will try to preload the config platform."""
+    """Verify async_get_component will try to preload the config and config_flow platform."""
     executor_import_integration = _get_test_integration(
         hass, "executor_import", True, import_executor=True
     )
@@ -1058,7 +1058,7 @@ async def test_async_get_component_preloads_config(
         await executor_import_integration.async_get_component()
 
     assert mock_platform_exists.call_count == 1
-    assert mock_import.call_count == 2
+    assert mock_import.call_count == 3
     assert (
         mock_import.call_args_list[0][0][0]
         == "homeassistant.components.executor_import"
@@ -1067,6 +1067,10 @@ async def test_async_get_component_preloads_config(
         mock_import.call_args_list[1][0][0]
         == "homeassistant.components.executor_import.config"
     )
+    assert (
+        mock_import.call_args_list[2][0][0]
+        == "homeassistant.components.executor_import.config_flow"
+    )
 
 
 async def test_async_get_component_deadlock_fallback(