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 gtk_widget_set_tooltip_text() and
gtk_entry_set_icon_tooltip_markup().
If you unset the widget tooltip via gtk_widget_set_tooltip_text() or
gtk_widget_set_tooltip_markup(), this sets GtkWidget:has-tooltip to %FALSE,
which suppresses icon tooltips too. You can resolve this by then calling
gtk_widget_set_has_tooltip() to set GtkWidget:has-tooltip back to %TRUE, or
setting at least one non-empty tooltip on any icon achieves the same result.
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 gtk_widget_set_tooltip_text() and gtk_entry_set_icon_tooltip_markup().
If you unset the widget tooltip via gtk_widget_set_tooltip_text() or gtk_widget_set_tooltip_markup(), this sets GtkWidget:has-tooltip to %FALSE, which suppresses icon tooltips too. You can resolve this by then calling gtk_widget_set_has_tooltip() to set GtkWidget:has-tooltip back to %TRUE, or setting at least one non-empty tooltip on any icon achieves the same result.