Fix publish topic update

app/src/actions/Tree.ts

@@ -1,9 +1,18 @@
-import { ActionTypes, CustomAction } from '../reducers'
+import { ActionTypes, CustomAction, AppState } from '../reducers'
 import * as q from '../../../backend/src/Model'
+import { Dispatch } from 'redux'
+import { setTopic } from './Publish'
 
-export const selectTopic = (topic: q.TreeNode): CustomAction => {
-  return {
+export const selectTopic = (topic: q.TreeNode) => (dispatch: Dispatch<any>, getState: () => AppState)  => {
+  const { selectedTopic } = getState().tooBigReducer
+
+  // Update publish topic
+  if (selectedTopic && (selectedTopic.path() === getState().publish.topic || !getState().publish.topic)) {
+    dispatch(setTopic(topic.path()))
+  }
+
+  dispatch({
     selectedTopic: topic,
     type: ActionTypes.selectTopic,
-  }
+  })
 }