Add more keyboard navigation options for inline comments

Summary:
  - Use n/p to jump between comments.
  - Use r to reply to the selected comment.
  - Use e to edit the selected comment.

Test Plan: Verified n, p, r, e, j, k, J, K, "click edit" and "click reply"
behavior in as many weird cases as I could come up with.

Reviewers: btrahan, jungejason, nh, cpiro, jl

Reviewed By: btrahan

CC: aran, btrahan, epriestley

Maniphest Tasks: T583

Differential Revision: https://secure.phabricator.com/D1308

webroot/rsrc/js/application/differential/behavior-edit-inline-comments.js

@@ -183,8 +183,13 @@ JX.behavior('differential-edit-inline-comments', function(config) {
     });
 
   var action_handler = function(op, e) {
-    var data = e.getNodeData('differential-inline-comment');
     var node = e.getNode('differential-inline-comment');
+    handle_inline_action(node, op);
+    e.kill();
+  }
+
+  var handle_inline_action = function(node, op) {
+    var data = JX.Stratcom.getData(node);
     var row  = node.parentNode.parentNode;
 
     var original = data.original;
@@ -203,8 +208,6 @@ JX.behavior('differential-edit-inline-comments', function(config) {
       .setRow(row)
       .setTable(row.parentNode)
       .start();
-
-    e.kill();
   }
 
   for (var op in {'edit' : 1, 'delete' : 1, 'reply' : 1}) {
@@ -214,5 +217,13 @@ JX.behavior('differential-edit-inline-comments', function(config) {
       JX.bind(null, action_handler, op));
   }
 
+  JX.Stratcom.listen(
+    'differential-inline-action',
+    null,
+    function(e) {
+      var data = e.getData();
+      handle_inline_action(data.node, data.op);
+    });
+
 });