ChangeScreen: explicitly load revision info

The new explicit loading of the revision actions is performed by the new
REST API call /changes/<id>/revisions/<id>/actions, which also checks other
changes for submittability if `submitWholeTopic` is enabled. This may slow
down revision loading, hence move it out in an extra async call.

Change-Id: I0be8bcef18aed34d912ab3048436bd62cbc47ead

gerrit-gwtui/src/main/java/com/google/gerrit/client/change/ChangeScreen.java

@@ -240,7 +240,10 @@ public class ChangeScreen extends Screen {
           @Override
           public void onSuccess(ChangeInfo info) {
             info.init();
+            // Revision loading may be slower than the rest, so do it
+            // asynchronous to have the rest fast.
             loadConfigInfo(info, base);
+            loadRevisionInfo();
           }
         }));
   }
@@ -248,7 +251,7 @@ public class ChangeScreen extends Screen {
   void loadChangeInfo(boolean fg, AsyncCallback<ChangeInfo> cb) {
     RestApi call = ChangeApi.detail(changeId.get());
     ChangeList.addOptions(call, EnumSet.of(
-      ListChangesOption.CURRENT_ACTIONS,
+      ListChangesOption.CHANGE_ACTIONS,
       ListChangesOption.ALL_REVISIONS));
     if (!fg) {
       call.background();
@@ -256,6 +259,18 @@ public class ChangeScreen extends Screen {
     call.get(cb);
   }
 
+  void loadRevisionInfo() {
+    RestApi call = ChangeApi.actions(changeId.get(), revision);
+    call.background();
+    call.get(new GerritCallback<NativeMap<ActionInfo>>() {
+      @Override
+      public void onSuccess(NativeMap<ActionInfo> actionMap) {
+        actionMap.copyKeysIntoChildren("id");
+        renderRevisionInfo(changeInfo, actionMap);
+      }
+    });
+  }
+
   @Override
   protected void onUnload() {
     if (replyAction != null) {
@@ -1074,12 +1089,9 @@ public class ChangeScreen extends Screen {
     }
     setWindowTitle(sb.toString());
 
-    RevisionInfo revInfo = info.revision(revision);
-    NativeMap<ActionInfo> actionMap = revInfo.has_actions()
-        ? info.actions()
-        : NativeMap.<ActionInfo> create();
-    actionMap.copyKeysIntoChildren("id");
-    renderRevisionInfo(info, actionMap);
+    // Properly render revision actions initially while waiting for
+    // the callback to populate them correctly.
+    renderRevisionInfo(changeInfo, NativeMap.<ActionInfo> create());
   }
 
   private void renderRevisionInfo(ChangeInfo info,