ChatViewer: options menu moved from ChatViewerFragment.

Light refactoring.

app/src/main/java/com/xabber/android/data/message/AbstractChat.java

@@ -646,9 +646,8 @@ public abstract class AbstractChat extends BaseEntity {
         int count = PRELOADED_MESSAGES
                 + NotificationManager.getInstance()
                 .getNotificationMessageCount(account, user);
-        Iterator<MessageItem> iterator = messages.iterator();
-        while (iterator.hasNext())
-            if (iterator.next().isIncoming()) {
+        for (MessageItem message : messages)
+            if (message.isIncoming()) {
                 count -= 1;
                 if (count <= 0)
                     return 0;

app/src/main/java/com/xabber/android/ui/adapter/ChatViewerAdapter.java

@@ -29,8 +29,6 @@ public class ChatViewerAdapter extends FragmentStatePagerAdapter {
 
     private FinishUpdateListener finishUpdateListener;
 
-    private Fragment currentFragment;
-
     private static final int TOTAL_COUNT = 200;
     private static final int OFFSET = TOTAL_COUNT / 2;
 
@@ -165,15 +163,6 @@ public class ChatViewerAdapter extends FragmentStatePagerAdapter {
         return realPosition - 1;
     }
 
-    @Override
-    public void startUpdate(ViewGroup container) {
-        if (currentFragment instanceof ChatViewerFragment) {
-            ((ChatViewerFragment)currentFragment).saveInputState();
-        }
-
-        super.startUpdate(container);
-    }
-
     @Override
     public void finishUpdate(ViewGroup container) {
         super.finishUpdate(container);