[libwnck] selector: set css name

[Marco Trevisan <marcotrevi src gnome org>]

commit 7ca020bda8676c1494bc5b377aaffc3f42d1fb25
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sat Feb 6 14:44:21 2016 +0200

    selector: set css name
    
    https://bugzilla.gnome.org/show_bug.cgi?id=761632

 libwnck/selector.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/libwnck/selector.c b/libwnck/selector.c
index 5de56cf..2f225c9 100644
--- a/libwnck/selector.c
+++ b/libwnck/selector.c
@@ -1264,6 +1264,10 @@ wnck_selector_class_init (WnckSelectorClass *klass)
   widget_class->realize   = wnck_selector_realize;
   widget_class->unrealize = wnck_selector_unrealize;
   widget_class->scroll_event = wnck_selector_scroll_event;
+
+#if GTK_CHECK_VERSION (3, 19, 1)
+  gtk_widget_class_set_css_name (widget_class, "wnck-selector");
+#endif
 }
 
 static GObject *