fix: initialize dropzoneSelector inside inline formsets in a Django 4.1 compatible way #1431
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Description
Django 4.1 changed the JavaScript event type being fired when adding a new formset from a jQuery to a vanilla JavaScript event. https://docs.djangoproject.com/en/4.1/ref/contrib/admin/javascript/
This broke the drag-and-drop feature when adding dynamic inlines containing Filer fields in e.g. the Django admin, because the dropzone failed to initialize.
This patch checks for Django 4.1 and initializes the dropzone on newly added inline rows.
Related resources
This fixes #1400.
Checklist
master
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