Remove top panel in alert dialog if empty.

Remove the topPanel in the alert dialog if it is empty and
therefore invisible. This gives the dialog content more space, and it
makes dialog positioning on the screen correct.

Change-Id: I8ffd9bd9b2360b0ad4338c32c21ab69c055d66a0

Author: Martin Sjolin

core/java/com/android/internal/app/AlertController.java

@@ -435,6 +435,7 @@ private boolean setupTitle(LinearLayout topPanel) {
                 View titleTemplate = mWindow.findViewById(R.id.title_template);
                 titleTemplate.setVisibility(View.GONE);
                 mIconView.setVisibility(View.GONE);
+                topPanel.setVisibility(View.GONE);
                 hasTitle = false;
             }
         }