Fix focus on tab when changing via back button

src/layouts/partial-cards.js

@@ -69,6 +69,7 @@ export default new Polymer({
         viewGetters.currentView,
         view => view || '',
       ],
+      observer: 'removeFocus',
     },
 
     views: {
@@ -119,6 +120,13 @@ export default new Polymer({
     this.columns = Math.max(1, matchColumns - this.showMenu);
   },
 
+  // When user changes tab by pressing back button, blur former tab
+  removeFocus() {
+    if (document.activeElement) {
+      document.activeElement.blur();
+    }
+  },
+
   handleRefresh() {
     syncActions.fetchAll();
   },