Update bookmark list before showing dialog.

Fixes #2100.

Override toggleVisible of BookmarkDialog to call update before using toggleVisible of QVLCFrame
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit b506e7db2cbd3cf8c7742efc59a6994fd2719477)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/qt4/dialogs/bookmarks.cpp

@@ -278,3 +278,14 @@ void BookmarksDialog::activateItem( QModelIndex index )
 
     input_Control( p_input, INPUT_SET_BOOKMARK, index.row() );
 }
+
+void BookmarksDialog::toggleVisible()
+{
+    /* Update, to show existing bookmarks in case a new playlist
+       was opened */
+    if( !isVisible() )
+    {
+        update();
+    }
+    QVLCFrame::toggleVisible();
+}

modules/gui/qt4/dialogs/bookmarks.hpp

@@ -35,6 +35,8 @@ class QPushButton;
 class BookmarksDialog : public QVLCFrame, public Singleton<BookmarksDialog>
 {
     Q_OBJECT
+public:
+    void toggleVisible();
 private:
     BookmarksDialog( intf_thread_t * );
     virtual ~BookmarksDialog();