make setFadeFoldWidgets on by default

demo/kitchen-sink/demo.js

@@ -475,6 +475,9 @@ bindCheckbox("enable_behaviours", function(checked) {
     env.editor.setBehavioursEnabled(checked);
 });
 
+bindCheckbox("fade_fold_widgets", function(checked) {
+    env.editor.setFadeFoldWidgets(checked);
+});
 
 var secondSession = null;
 bindDropdown("split", function(value) {

kitchen-sink.html

@@ -200,6 +200,14 @@
         <input type="checkbox" id="enable_behaviours">
       </td>
     </tr>
+    <tr>
+      <td >
+        <label for="fade_fold_widgets">Fade Fold Widgets</label>
+      </td>
+      <td>
+        <input type="checkbox" id="fade_fold_widgets" checked>
+      </td>
+    </tr>
     </table>
 
     <div id="editor">

lib/ace/virtual_renderer.js

@@ -85,6 +85,7 @@ var VirtualRenderer = function(container, theme) {
 
     this.$gutterLayer = new GutterLayer(this.$gutter);
     this.$gutterLayer.on("changeGutterWidth", this.onResize.bind(this, true));
+    this.setFadeFoldWidgets(true);
 
     this.$markerBack = new MarkerLayer(this.content);