Fixing alerts to not show already handled alerts.

src/components/farm/reducers.js

@@ -190,11 +190,12 @@ export default function(state = initialState, action) {
     case MARK_ACTION_CHANGE_HANDLED:
         return { ...state, ui: { ...state.ui, actionChangeHandled: true }};
     case ALERT:
+        let existingAlert = state.ui.alerts[action.id];
         let alerts = { ...state.ui.alerts,
                        [action.id]: { type: action.value,
                                       id: action.id,
                                       contents: action.contents,
-                                      handled: false }
+                                      handled: existingAlert ? existingAlert.handled : false }
                      };
         return { ...state, ui: { ...state.ui,
                                  alerts,