Plugin update warning

Not possible unless you plan in advance in your plugin for such a possibility. And even if it was somehow possible you are still not likely to have any user read the message and actually understand it.

A more realistic approach is to do a two steps upgrade, in the first vesion of your plugin to maintain appropriate backward compatibility and only later you remove it from your code, giving both you the option to give proper notification, and the user time to adjust whatever he needs.

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