setIconTooltipText
Sets @tooltip as the contents of the tooltip for the icon at the specified position.
Use null for @tooltip to remove an existing tooltip.
See also method@Gtk.Widget.set_tooltip_text and method@Gtk.Entry.set_icon_tooltip_markup.
If you unset the widget tooltip via method@Gtk.Widget.set_tooltip_text or method@Gtk.Widget.set_tooltip_markup, this sets property@Gtk.Widget:has-tooltip to false, which suppresses icon tooltips too. You can resolve this by then calling method@Gtk.Widget.set_has_tooltip to set property@Gtk.Widget:has-tooltip back to true, or setting at least one non-empty tooltip on any icon achieves the same result.
Parameters
iconPos
the icon position
tooltip
the contents of the tooltip for the icon