HTML escaping issue with Raw HTML copy button for image uploads

[thibaudcolas]

In the Image Uploads admin, the "Raw HTML" button should escape the contents of its data-clipboard-content attribute. Otherwise this creates malformed HTML.

Here I think:

djangoproject.com/blog/admin.py

Lines 80 to 83 in 9c2e5a7

	source = contentformat.img(obj.image.url, obj.alt_text)
	return format_html(
	'<button type="button" data-clipboard-content="{}">{}</button>',
	source,

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Assigning to @vladimir-slavov-iob!

[anya-xcode]

@thibaudcolas I want to work on this issue. Could you please assign it to me?