An enumeration used to specify which extension events
are desired for a particular widget.
GDK_EXTENSION_EVENTS_NONE
no extension events are desired.
GDK_EXTENSION_EVENTS_ALL
all extension events are desired.
GDK_EXTENSION_EVENTS_CURSOR
extension events are desired only if a cursor
will be displayed for the device.
An enumeration used to specify which extension events are desired for a particular widget. GDK_EXTENSION_EVENTS_NONE no extension events are desired. GDK_EXTENSION_EVENTS_ALL all extension events are desired. GDK_EXTENSION_EVENTS_CURSOR extension events are desired only if a cursor will be displayed for the device.