Robert Bragg 07652c76fb window_ondemand: wait for Destroyed event before exiting app ...

Considering the strict requirement that applications can't keep windows
across run_ondemand calls, this tries to make the window_ondemand example
explicitly wait for its Window to be destroyed before exiting each
run_ondemand iteration.

This updates the example to only `.set_exit()` after it gets a
`Destroyed` event after the Window has been dropped.

On Windows this works to ensure the Window is destroyed before the
example waits for 5 seconds.

Unfortunately though:
1. The Wayland backend doesn't emit `Destroyed` events for windows
2. The macOS backend emits `Destroyed` events before the window is
   really destroyed.

and so the example isn't currently portable.

2023-08-15 13:10:02 +04:00

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