The ::delete-event signal is emitted if a user requests that
a toplevel window is closed. The default handler for this signal
destroys the window. Connecting
this signal will cause the window to be hidden instead, so that
it can later be shown again without reconstructing it.
|Default handler:|| |
The default handler is called after the handlers added via
The event which triggered this signal.
|The data is owned by the caller of the function.|