Widget o2m Attachment Image Gallery Widget

This module adds a new field widget called o2m_attachment_image_gallery that can be used on one-to-many attachment fields in Odoo views, including Kanban views.

When a record has attachments, the widget loads them and displays the first image as a preview (up to 180 pixels high, cropped to fill the width). Clicking that preview opens Odoo's built-in file viewer, where the user can browse through all the attached images.

• The widget reads the attachment records linked to the current record and collects their name and file type.
• If the record has no attachments, nothing is shown.
• The preview image is loaded from the standard Odoo image route for attachments.
• Clicking the preview opens the file viewer starting at the first image, with all attachments available to scroll through.

The module only depends on the web module and does not add any new database models, menus, reports, or automated business rules. It is purely a display component: it changes how attachment images appear in a form or Kanban view, without changing any stored data. It is registered in the fields registry under the name o2m_attachment_image_gallery, so developers can assign it to a field in a view definition.