ChangeScreen2: Display currently viewed patch set in Revisions title

Change-Id: Ib9a203d86a1662769934f51458f59e2cccb3cd7f
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

gerrit-gwtui/src/main/java/com/google/gerrit/client/change/ChangeScreen2.java

@@ -159,6 +159,7 @@ public class ChangeScreen2 extends Screen {
 
   @UiField Button includedIn;
   @UiField Button revisions;
+  @UiField Element revisionsText;
   @UiField Button download;
   @UiField Button reply;
   @UiField Button expandAll;
@@ -326,6 +327,18 @@ public class ChangeScreen2 extends Screen {
   }
 
   private void initRevisionsAction(ChangeInfo info, String revision) {
+    int currentPatchSet;
+    if (info.current_revision() != null
+        && info.revisions().containsKey(info.current_revision())) {
+      currentPatchSet = info.revision(info.current_revision())._number();
+    } else {
+      JsArray<RevisionInfo> revList = info.revisions().values();
+      RevisionInfo.sortRevisionInfoByNumber(revList);
+      currentPatchSet = revList.get(revList.length() - 1)._number();
+    }
+    int currentlyViewedPatchSet = info.revision(revision)._number();
+    revisionsText.setInnerText(Resources.M.revisions(
+        currentlyViewedPatchSet, currentPatchSet));
     revisionsAction = new RevisionsAction(
         info.legacy_id(), revision,
         style, headerLine, revisions);

gerrit-gwtui/src/main/java/com/google/gerrit/client/change/ChangeScreen2.ui.xml

@@ -359,7 +359,7 @@ limitations under the License.
             <div><ui:msg>Included in</ui:msg></div>
           </g:Button>
           <g:Button ui:field='revisions' styleName=''>
-            <div><ui:msg>Revisions</ui:msg></div>
+            <div ui:field='revisionsText'/>
           </g:Button>
           <g:Button ui:field='download' styleName=''>
             <div><ui:msg>Download</ui:msg></div>

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

@@ -15,6 +15,7 @@
 package com.google.gerrit.client.change;
 
 public interface Messages extends com.google.gwt.i18n.client.Messages {
+  String revisions(int currentlyViewedPatchSet, int currentPatchSet);
   String changeWithNoRevisions(int changeId);
   String relatedChanges(int count);
   String relatedChanges(String count);

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

@@ -1,3 +1,4 @@
+revisions = Revisions ({0}/{1})
 changeWithNoRevisions = Cannot display change {0} because it has no revisions.
 relatedChanges = Related Changes ({0})
 conflictingChanges = Conflicts With ({0})