stylecontext: Set state flags on widget paths

Set the widget path state flags with the state flags of the style
context.

We do not update the state flags but replace the previous one because we
want to be able to have save()/restore() unset state flags.

gtk/gtkstylecontext.c

@@ -747,6 +747,10 @@ G_GNUC_END_IGNORE_DEPRECATIONS
                                       g_quark_to_string (quark));
     }
 
+  /* Set widget state */
+  gtk_widget_path_iter_set_state (path, pos,
+                                  gtk_widget_path_iter_get_state (path, pos) | info->state_flags);
+
   return path;
 }