[Feature Request]: Ability to crop a poster when choosing it

[IDAZIZ]

Preflight Checklist

• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Describe your suggested feature

sometimes my comic's poster is not vertical, so i have to make a copy of it then crop it and keep it in my posters folder, i would love if it's possible to add the ability to crop the poster when choosing it.

Additional Information

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Sample file

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