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 #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().
the contents of the tooltip for @widget, or %NULL
2.12
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 #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().