[gedit] FileChooser: keep a ref to the GtkFileFilter for setting it as default

[Sébastien Wilmet <swilmet src gnome org>]

commit 397f3a0b827c877bdc418fa8c966c5f548220bdc
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Mon Jun 8 20:24:16 2020 +0200

    FileChooser: keep a ref to the GtkFileFilter for setting it as default
    
    See the docs of gtk_file_chooser_add_filter().

 gedit/gedit-file-chooser.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/gedit/gedit-file-chooser.c b/gedit/gedit-file-chooser.c
index 342f8d901..eea6719bb 100644
--- a/gedit/gedit-file-chooser.c
+++ b/gedit/gedit-file-chooser.c
@@ -153,25 +153,29 @@ _gedit_file_chooser_setup_filters (GtkFileChooser *chooser)
                                    all_text_files_filter,
                                    NULL,
                                    NULL);
-       gtk_file_chooser_add_filter (chooser, filter);
 
+       g_object_ref_sink (filter);
+       gtk_file_chooser_add_filter (chooser, filter);
        if (active_filter != 1)
        {
                /* Use this filter if set by user and as default. */
                gtk_file_chooser_set_filter (chooser, filter);
        }
+       g_object_unref (filter);
 
        /* "All Files" filter */
        filter = gtk_file_filter_new ();
        gtk_file_filter_set_name (filter, ALL_FILES);
        gtk_file_filter_add_pattern (filter, "*");
-       gtk_file_chooser_add_filter (chooser, filter);
 
+       g_object_ref_sink (filter);
+       gtk_file_chooser_add_filter (chooser, filter);
        if (active_filter == 1)
        {
                /* Use this filter if set by user. */
                gtk_file_chooser_set_filter (chooser, filter);
        }
+       g_object_unref (filter);
 
        g_signal_connect (chooser,
                          "notify::filter",