Sets tooltip as the contents of the tooltip for the icon at
the specified position. tooltip is assumed to be marked up with
the Pango text markup language.
Use NULL for tooltip to remove an existing tooltip.
See also gtk_widget_set_tooltip_markup() and
gtk_enty_set_icon_tooltip_text().
Since 2.16
Sets tooltip as the contents of the tooltip for the icon at the specified position. tooltip is assumed to be marked up with the Pango text markup language. Use NULL for tooltip to remove an existing tooltip. See also gtk_widget_set_tooltip_markup() and gtk_enty_set_icon_tooltip_text(). Since 2.16