Sets the icon for the tool button from a named themed icon.
See the docs for #GtkIconTheme for more details.
The #GtkToolButton:icon-name property only has an effect if not
overridden by non-%NULL #GtkToolButton:label-widget,
#GtkToolButton:icon-widget and #GtkToolButton:stock-id properties.
Sets the icon for the tool button from a named themed icon. See the docs for #GtkIconTheme for more details. The #GtkToolButton:icon-name property only has an effect if not overridden by non-%NULL #GtkToolButton:label-widget, #GtkToolButton:icon-widget and #GtkToolButton:stock-id properties.