Returns the icon size used for @tool_item. Custom subclasses of #GtkToolItem should call this function to find out what size icons they should use.
Return: a #GtkIconSize indicating the icon size used for @tool_item
2.4
See Implementation
Returns the icon size used for @tool_item. Custom subclasses of #GtkToolItem should call this function to find out what size icons they should use.
Return: a #GtkIconSize indicating the icon size used for @tool_item