Warning
gtk_tool_item_set_tooltip has been deprecated since version 2.12 and should not be used in newly-written code. Use gtk_tool_item_set_tooltip_text() instead.
Sets the GtkTooltips object to be used for tool_item, the
text to be displayed as tooltip on the item and the private text
to be used. See gtk_tooltips_set_tip().
Since 2.4
Warning gtk_tool_item_set_tooltip has been deprecated since version 2.12 and should not be used in newly-written code. Use gtk_tool_item_set_tooltip_text() instead. Sets the GtkTooltips object to be used for tool_item, the text to be displayed as tooltip on the item and the private text to be used. See gtk_tooltips_set_tip(). Since 2.4