On Wayland, for tooltips to work as expected, the type hint must be set
to tooltips, otherwise the popup window won't be translated as a
subsurface.
Fix the test do work as expected under Wayland.
Bugzilla: https://bugzilla.gnome.org/show_bug.cgi?id=759018
gtk_widget_show (tooltip_button);
gtk_widget_set_tooltip_window (button, GTK_WINDOW (tooltip_window));
+ gtk_window_set_type_hint (GTK_WINDOW (tooltip_window),
+ GDK_WINDOW_TYPE_HINT_TOOLTIP);
+ gtk_window_set_transient_for (GTK_WINDOW (tooltip_window),
+ GTK_WINDOW (window));
+
g_signal_connect (button, "query-tooltip",
G_CALLBACK (query_tooltip_custom_cb), NULL);
g_object_set (button, "has-tooltip", TRUE, NULL);