Let admins crop pictures on Decidim
Is your feature request related to a problem? Please describe.
As an admin, it can be hard to add an image to a banner or a process because you can't preview the result and because Decidim arbitrarily crops the image to fit the space it's supposed to be in.
Describe the solution you'd like
On many websites, it's possible to crop the picture using an intuitive draggable rectangle over the picture (see picture).
Describe alternatives you've considered
For now, we try to give admins tips about the size their image should be in before uploading it but it doesn't always work. An alternative would be to preview the content.
This would be solved with the use of a server-side JS library such as jquery-cropper.
Does this issue could impact on users private data?
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