Sets markup as the contents of the tooltip, which is marked up with
the Pango text markup language.
This function will take care of setting GtkWidget:has-tooltip to TRUE
and of the default handler for the GtkWidget::query-tooltip signal.
See also the GtkWidget:tooltip-markup property and
gtk_tooltip_set_markup().
Since 2.12
Sets markup as the contents of the tooltip, which is marked up with the Pango text markup language. This function will take care of setting GtkWidget:has-tooltip to TRUE and of the default handler for the GtkWidget::query-tooltip signal. See also the GtkWidget:tooltip-markup property and gtk_tooltip_set_markup(). Since 2.12