Sets @markup as the contents of the tooltip, which is marked up with the [Pango text markup language]PangoMarkupFormat.
This function will take care of setting #GtkStatusIcon:has-tooltip to %TRUE and of the default handler for the #GtkStatusIcon::query-tooltip signal.
See also the #GtkStatusIcon:tooltip-markup property and gtk_tooltip_set_markup().
the contents of the tooltip for @status_icon, or %NULL
Deprecated: Use #GNotification and #GtkApplication to provide status notifications; there is no direct replacement for this function
2.16
See Implementation
Sets @markup as the contents of the tooltip, which is marked up with the [Pango text markup language]PangoMarkupFormat.
This function will take care of setting #GtkStatusIcon:has-tooltip to %TRUE and of the default handler for the #GtkStatusIcon::query-tooltip signal.
See also the #GtkStatusIcon:tooltip-markup property and gtk_tooltip_set_markup().