[epiphany] bookmarks-popover: Fix missing conditional in previous patch

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 80bfba17a18056900b1b90f9347d6440a0b99fb9
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Mon Jan 23 21:43:44 2017 -0600

    bookmarks-popover: Fix missing conditional in previous patch
    
    No reason to mess with the tag detail list box if it's not visible.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=772131

 src/bookmarks/ephy-bookmarks-popover.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/src/bookmarks/ephy-bookmarks-popover.c b/src/bookmarks/ephy-bookmarks-popover.c
index c8ceede..56053d3 100644
--- a/src/bookmarks/ephy-bookmarks-popover.c
+++ b/src/bookmarks/ephy-bookmarks-popover.c
@@ -72,7 +72,6 @@ ephy_bookmarks_popover_bookmark_tag_added_cb (EphyBookmarksPopover *popover,
 
   /* If the bookmark no longer has 0 tags, we remove it from the tags list box */
   if (g_sequence_get_length (ephy_bookmark_get_tags (bookmark)) == 1) {
-    GtkWidget *row;
     GList *children;
     GList *l;
 
@@ -88,8 +87,11 @@ ephy_bookmarks_popover_bookmark_tag_added_cb (EphyBookmarksPopover *popover,
     /* If we are on the tag detail list box, then the user has toggled the state
      * of the tag widget multiple times. The first time the bookmark was removed
      * from the list box. Now we have to add it back. */
-    row = create_bookmark_row (bookmark, popover);
-    gtk_container_add (GTK_CONTAINER (popover->tag_detail_list_box), row);
+    if (g_strcmp0 (visible_stack_child, "tag_detail") == 0) {
+      GtkWidget *row;
+      row = create_bookmark_row (bookmark, popover);
+      gtk_container_add (GTK_CONTAINER (popover->tag_detail_list_box), row);
+    }
   }
 }