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Image Field extending with Markup Support

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In another topic Ryan introduced a simple module to extend the functionality of the image input field.

I want to go a little bit further by extending the description textarea with the usage of the Markup fields and editors, configurable in the image extra input. I tried to copy some parts from the other input fields but don't get it to work properly.

In the end I would like to have an image input field with title and description, where the description should use markdown extra and the ace editor textarea field.

Anyone who can help me with that?

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As an addition I also tried using a repeater that contains a single image with a textarea field. Unfortunately I already use a repeater for the content that holds the image and as stated here it is not possible to use repeater inside repeater.

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