erp5_document_scanner: Add a tales expression as default field value
The default value is a JSON containing 2 keys: - the relative_url of an active process - the list of active process image content to aggregate By default, when the field is rendered for the first time, this tales expression is evaluated and a new active process is created at that point. So, default json is like: {active_process: 'portal_activities/1234', image_list: []} * store the active_process relative_url in the gadget state in the render method * store the image_list in the gadget state in the render_method * change getContent method to send a json build from the active_process and image_list state
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