fix(web): legacy plugin-system toggles no longer count as a General save

auto_discover, auto_load_enabled and development_mode have left the General
form, so a post carrying only one of them is not a general-settings save and
must not treat web_display_autostart and auto_update as unchecked. The
plugin_system block itself is left as on main for the branch that reworks it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

test/test_api_v3_partial_main_save.py

@@ -92,12 +92,23 @@ class TestJsonPartialSaves:
         assert config['web_display_autostart'] is True
         assert config['auto_update'] == {'enabled': True}
 
-    def test_location_only_keeps_plugin_system_toggles(self, api_v3_client, saved):
+    def test_location_only_keeps_autostart_and_auto_update(self, api_v3_client, saved):
-        resp = _post_json(api_v3_client, {'city': 'Paris', 'plugins_directory': 'plugin-repos'})
+        resp = _post_json(api_v3_client, {'city': 'Paris', 'country': 'FR'})
         assert resp.status_code == 200, resp.get_json()
-        assert saved['config']['plugin_system'] == {
+        config = saved['config']
-            'auto_discover': True, 'auto_load_enabled': True,
+        assert config['location'] == {'city': 'Paris', 'country': 'FR'}
-            'development_mode': True, 'plugins_directory': 'plugin-repos'}
+        assert config['web_display_autostart'] is True
+        assert config['auto_update'] == {'enabled': True}
+
+    @pytest.mark.parametrize('key', ['auto_discover', 'auto_load_enabled', 'development_mode'])
+    def test_a_legacy_plugin_system_toggle_is_not_a_general_save(self, api_v3_client, saved, key):
+        # These left the General form; a client still sending one must not
+        # have the general-settings checkboxes treated as unchecked.
+        resp = api_v3_client.post('/api/v3/config/main', data={key: 'on'},
+                                  content_type='application/x-www-form-urlencoded')
+        assert resp.status_code == 200, resp.get_json()
+        assert saved['config']['web_display_autostart'] is True
+        assert saved['config']['auto_update'] == {'enabled': True}
 
     def test_vegas_speed_only_keeps_vegas_toggles(self, api_v3_client, saved):
         resp = _post_json(api_v3_client, {'vegas_scroll_speed': 80})

web_interface/blueprints/api_v3/config.py

@@ -496,8 +496,7 @@ def save_main_config():
         # Note: Checkboxes don't send data when unchecked, so we need to check if we're updating general settings
         # If any general setting is present, we're updating the general tab
         is_general_update = any(k in data for k in ['timezone', 'city', 'state', 'country', 'web_display_autostart',
-                                                     'auto_discover', 'auto_load_enabled', 'development_mode', 'plugins_directory',
+                                                     'plugins_directory', 'auto_update_enabled'])
-                                                     'auto_update_enabled'])
 
         if is_general_update:
             # For checkbox: if not present in data during a general *form*
@@ -560,7 +559,7 @@ def save_main_config():
             # Handle plugin system checkboxes - always set to handle unchecked state
             # HTML checkboxes omit the key when unchecked, so missing key = unchecked = False
             for checkbox in ['auto_discover', 'auto_load_enabled', 'development_mode']:
-                _set_checkbox(current_config['plugin_system'], checkbox, checkbox)
+                current_config['plugin_system'][checkbox] = _coerce_to_bool(data.get(checkbox))
 
             # Handle plugins_directory
             if 'plugins_directory' in data: