km_kbp_state_options_update should set the persisted cache copy as well.

common/engine/keyboardprocessor/src/kmx/kmx_processevent.cpp

@@ -56,6 +56,7 @@ namespace km {
       switch(scope) {
         case KM_KBP_OPT_KEYBOARD:
           _kmx.GetOptions()->Set(key, value);
+          persisted_store()[key] = value;
           break;
         case KM_KBP_OPT_ENVIRONMENT:
           _kmx.GetEnvironment()->Load(key, value);

common/engine/keyboardprocessor/src/mock/mock_processor.cpp

@@ -99,6 +99,7 @@ namespace km {
       if (i == _options.end()) return option();
 
       i->second = value;
+      persisted_store()[key] = value;
       return option(scope, key, i->second);
     }