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Use this widget to show a thumbnail of the image next to the image file.
If using the admin and :class:`~easy_thumbnails.fields.ThumbnailerField`,
you can use this widget automatically with the following code::
class MyModelAdmin(admin.ModelAdmin):
formfield_overrides = {
ThumbnailerField: {'widget': ImageClearableFileInput},
}
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Set up the thumbnail options for this widget.
:param thumbnail_options: options used to generate the thumbnail. If no
``size`` is given, it'll be ``(80, 80)``. If not provided at all,
default options will be used from the
:attr:`~easy_thumbnails.conf.Settings.THUMBNAIL_WIDGET_OPTIONS`
setting.
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