Rename XTypeGroup's macUTIs

[stuartmorgan-g]

We have a field called macUTIs, but it will be used for iOS too. We should rename it, with aliases (using get and set) to preserve backward compatibility.

[juandausa]

Hi @stuartmorgan, I was looking into starting contributing a bit to the project.
We looked into the code and discovered that both the Mac and iOS implementation use the property macUTIs. We modified the main example to include this field, and it's currently working on the different platforms.

Furthermore, we believe that changing macUTIs to cupertinoUTIs would be a good replacement but, it will generate a breaking change. Can you elaborate on the way you proposed to preserve backward compatibility?

Thanks,

[stuartmorgan-g]

Furthermore, we believe that changing macUTIs to cupertinoUTIs would be a good replacement

cupertino is a confusing term in many contexts, and in the framework it explicitly means "iOS" not "iOS and macOS", so I definitely don't want to use it here. We should just call it uniformTypeIdentifiers, since that's an unambiguous term.

Can you elaborate on the way you proposed to preserve backward compatibility?

macUTIs can be left as a synthetic property that forwards to the new name. I.e., a construction like:

class Foo {
  bool foo = false;
  bool get bar => foo;
  set bar(bool value) { foo = value; }
}

Once that's published and file_selector has been updated to use the new names, the old name can be @Deprecated.

[juandausa]

Hi @stuartmorgan we appreciate your prompt response and clarification, we'll take this approach.

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