Use EditEngine stacked comments in Diffusion

Summary: Ref T10978. Ref T8739. Fixes T10446. Converts Diffusion to modern comment/preview code, like Differential.

Test Plan: {F2342933}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10978, T10446, T8739

Differential Revision: https://secure.phabricator.com/D17183

webroot/rsrc/js/application/differential/behavior-keyboard-nav.js

@@ -173,16 +173,6 @@ JX.behavior('differential-keyboard-navigation', function(config) {
       refreshFocus();
     });
 
-  var haunt_mode = 0;
-  function haunt() {
-    haunt_mode = (haunt_mode + 1) % 3;
-
-    var el = JX.$(config.haunt);
-    for (var ii = 1; ii <= 2; ii++) {
-      JX.DOM.alterClass(el, 'differential-haunt-mode-'+ii, (haunt_mode == ii));
-    }
-  }
-
   new JX.KeyboardShortcut('j', 'Jump to next change.')
     .setHandler(function(manager) {
       jump(manager, 1);
@@ -271,10 +261,4 @@ JX.behavior('differential-keyboard-navigation', function(config) {
     })
     .register();
 
-  if (config.haunt) {
-    new JX.KeyboardShortcut('z', 'Cycle comment panel haunting modes.')
-      .setHandler(haunt)
-      .register();
-  }
-
 });