widgets: fix focus-out warning on set_sensitive

src/settings/setting/widgets/BaseWidget.py

@@ -35,6 +35,12 @@ class BaseWidget:
         self.row.set_visible(visible)
 
     def set_enabled(self, enabled: bool):
+        if not enabled:
+            root = self.row.get_root()
+            if root:
+                focus = root.get_focus()
+                if focus and focus.is_ancestor(self.row):
+                    root.set_focus(None)
         self.row.set_sensitive(enabled)
 
     def set_busy(self, busy: bool):