fix disappearing e-table headers by realising the (horrible)

pet widget we are going to steal the gc from, so it actually has it.

widgets/table/e-table-header-utils.c

@@ -352,6 +352,7 @@ e_table_header_draw_button (GdkDrawable *drawable, ETableCol *ecol,
 		g_label = GTK_BIN(button)->child;
 		g_object_add_weak_pointer (G_OBJECT (g_label), &g_label);
 		gtk_widget_ensure_style (g_label);
+		gtk_widget_realize (g_label);
 	}
 
 	gc = GTK_WIDGET (g_label)->style->fg_gc[state];