many changes related to #1192:

- use CSS contain wherever possible to reduce subtrees of forced reflows
- reduced dependency between note and note_contents updates which will reduce number of updates to components
- optimization of "many rows" querying

src/public/app/widgets/history_navigation.js

@@ -23,6 +23,7 @@ export default class HistoryNavigationWidget extends BasicWidget {
     doRender() {
         if (utils.isElectron()) {
             this.$widget = $(TPL);
+            this.contentSized();
 
             const contextMenuHandler = e => {
                 e.preventDefault();