Fixed restoring pane visibility

app/src/main/java/eu/faircode/email/ActivityView.java

@@ -719,8 +719,8 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
         int count = fm.getBackStackEntryCount();
         if (count > 1 && "thread".equals(fm.getBackStackEntryAt(count - 1).getName())) {
             Fragment fragment = fm.findFragmentByTag("thread");
-            if (fragment != null &&
-                    fragment.getId() == (content_pane == null ? R.id.content_pane : R.id.content_frame)) {
+            if (fragment != null) {
+                if (fragment.getId() == (content_pane == null ? R.id.content_pane : R.id.content_frame)) {
                     Log.i("Moving pane=" + (content_pane != null) + " fragment=" + fragment);
                     fm.popBackStack("thread", FragmentManager.POP_BACK_STACK_INCLUSIVE);
                     Fragment newFragment = Helper.recreateFragment(fragment, fm);
@@ -728,6 +728,8 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
                     ft.replace(content_pane == null ? R.id.content_frame : R.id.content_pane, newFragment, "thread")
                             .addToBackStack("thread");
                     ft.commit();
+                }
+
                 if (content_pane != null) {
                     content_separator.setVisibility(View.VISIBLE);
                     content_pane.setVisibility(View.VISIBLE);