GtkRcPropertyParser for use with gtkSettingsInstallPropertyParser
or gtkWidgetClassInstallStylePropertyParser which parses a single
enumeration value.gtkRcPropertyParseEnum(pspec, gstring)pspecgstringcharacter to be parsedTRUE if gstring could be parsed and property.value
has been set to the resulting GEnumValue.property.valueR object which must hold enum values.