[devhelp: 14/16] Window: use dh_book_manager_get_singleton()

[Sébastien Wilmet <swilmet src gnome org>]

commit 06fd9ccea1a473a1b9d8a087d5734eee5f00783c
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Mon May 1 18:35:16 2017 +0200

    Window: use dh_book_manager_get_singleton()

 src/dh-window.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/dh-window.c b/src/dh-window.c
index 1197205..280f30f 100644
--- a/src/dh-window.c
+++ b/src/dh-window.c
@@ -901,7 +901,7 @@ find_library_equivalent (DhWindow    *window,
                 return NULL;
         }
 
-        book_manager = dh_app_peek_book_manager (DH_APP (gtk_window_get_application (GTK_WINDOW (window))));
+        book_manager = dh_book_manager_get_singleton ();
 
         for (books = dh_book_manager_get_books (book_manager);
              local_uri == NULL && books != NULL;