[evolution] Forbid header bars in stock GTK+ dialogs.

[Matthew Barnes <mbarnes src gnome org>]

commit 250620dd3dacd62645d820859c05a90389dcf0d0
Author: Matthew Barnes <mbarnes redhat com>
Date:   Tue Mar 18 09:30:46 2014 -0400

    Forbid header bars in stock GTK+ dialogs.
    
    Even in GNOME Shell, header bars look very out of place in Evolution.
    Override the system-wide setting to suppress them.

 shell/e-shell.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/shell/e-shell.c b/shell/e-shell.c
index b1a8e7e..2c1ae2f 100644
--- a/shell/e-shell.c
+++ b/shell/e-shell.c
@@ -801,6 +801,14 @@ shell_window_added (GtkApplication *application,
                (gintptr) window);
        gtk_window_set_role (window, role);
        g_free (role);
+
+#if GTK_CHECK_VERSION(3,11,5)
+       /* Forbid header bars in stock GTK+ dialogs.
+        * They look very out of place in Evolution. */
+       g_object_set (
+               gtk_widget_get_settings (GTK_WIDGET (window)),
+               "gtk-dialogs-use-header", FALSE, NULL);
+#endif
 }
 
 static gboolean