Use an alternative and arguably simpler (at least with real-life
applications, where settings are somewhat more complex) way of handling
the differences between platforms in the preferences sample: instead of
executing completely different code under different platforms, always
update the local copy of the settings immediately and just propagate, or
not, it to the application-level settings depending on the current
platform.
This costs an extra copy of the settings object on each change, but this
shouldn't be a problem in practice, and OTOH results in using mostly the
same code under all platforms, reducing the probability of
platform-specific bugs and avoiding any code duplication between the
event handlers and TransferDataFromWindow().
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