clear tags and categories when switching to narrative

src/components/Layout.js

@@ -76,7 +76,11 @@ class Dashboard extends React.Component {
 
   setNarrative (narrative) {
     // only handleSelect if narrative is not null
-    if (narrative) { this.handleSelect([ narrative.steps[0] ]) }
+    if (narrative) {
+      this.props.actions.clearFilter('tags')
+      this.props.actions.clearFilter('categories')
+      this.handleSelect([ narrative.steps[0] ])
+    }
     this.props.actions.updateNarrative(narrative)
   }
 

src/reducers/app.js

@@ -144,6 +144,15 @@ function toggleFilter (appState, action) {
   }
 }
 
+function clearFilter (appState, action) {
+  return {
+    ...appState,
+    filters: {
+      ...appState.filters,
+      [action.filter]: []
+    }
+  }
+}
 
 function updateTimeRange (appState, action) { // XXX
   return {