[gtk+] GtkAboutDialog: Make credits section keyboard navigatable

[Matthias Clasen <matthiasc src gnome org>]

commit e478ec09b860d76fd61b95f594d5f9af4b69d8e2
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat May 2 10:42:15 2015 -0400

    GtkAboutDialog: Make credits section keyboard navigatable
    
    Its the right thing to do.

 gtk/gtkaboutdialog.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkaboutdialog.c b/gtk/gtkaboutdialog.c
index 374800d..24780fc 100644
--- a/gtk/gtkaboutdialog.c
+++ b/gtk/gtkaboutdialog.c
@@ -2288,6 +2288,7 @@ add_credits_section (GtkAboutDialog  *about,
 
       label = gtk_label_new (str->str);
       gtk_label_set_use_markup (GTK_LABEL (label), TRUE);
+      gtk_label_set_selectable (GTK_LABEL (label), TRUE);
       g_signal_connect_swapped (label, "activate-link",
                                 G_CALLBACK (emit_activate_link), about);
       g_string_free (str, TRUE);