> Non-'@objc' instance method in extensions cannot be overridden;
> use 'public' instead

Ideally, this should be removed once the warnings have been addressed

…' into mokagio/xcode-15.3

@mokagio This should fix the `testPaste{Image,Video}WithoutFormatting` test failures.
 - I have searched the code for `decodeObject(forKey` occurrences and confirmed there wasn't any left
 - But I have not triple-checked that *every* custom subclass of anything we might encode in our `NSAttributedString` attributes have had `+supportsSecureCoding` redefined

Indeed, apparently, **even if** the parent class already overrides it to return `true`, subclasses which override `init?(coder:)`/`encode(with:)` from their parent class need to also re-override `+supportsSecureCoding`. I've added the overrides in classes that I've modified, but there may be more classes that might not be covered by our unit tests around archiving/pasting but would still require it to be added? So would be worth making another pass to be sure we didn't forget any,

…inText`

Since newer versions of iOS use this new `public.utf8-plain-text` UTI instead of `public.plain-text` like in previous OS versions.

This reverts commit 5c3004b, because I'm not convinced that's a good idea.

We should double-check that **not** having `+supportsSecureCoding` declared on this subclass doesn't make it fail to be copy/pasted (i.e. archived/unarchived)—like similar cases happened when running Aztec tests. Or if we need `+supportsSecureCoding`, we need to find a way to override/redefine it across module boundaries…

Fix - Shortcode test