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d944b8728c
Committing this sample for posterity's sake. This is the product of an experiment: "can an extension know when it's page was opened / closed?" And without changing the actual SDK, this **is** possible. It relies on the fact that CmdPal (the host) needs to register for the `ItemsChanged` event on list pages, and it does that when the page is loaded, and it unregisters itself when the page is closed. This does require manually implementing `IListPage` - you can't just `override` the `event` in the base class ([that's illegal](https://learn.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca1070)), and using `new` to shadow it doesn't work either (probably for cswinrt reasons). This is the best I came up with.