Vadim Zeitlin 7158c9b5be Use Destroy() rather than delete for dialogs in the sample ...

Even though it doesn't make any real difference for these dialogs, we
still shouldn't delete top level windows directly and should rather call
Destroy() on them to let them be cleaned up during the next idle time
processing.

See #18747.

2020-05-03 20:21:23 +02:00

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