Form in form makes media page html invalid

[nikrou]

The media page is invalid because we put form in form. To see the problem try to attach a media to a post entry. The result page admin/media.php?post_id=N is invalid.

I propose to change the form (to attach a media) by a link (tag a). In javascript we convert the link target to a post request so that admin/post_media.php behaves like today. Just have to add a test in admin/post_media.php to return an url if its an ajax request.

The only issue is to attach a media to a script when user doesn't have javascript enable. We cannot convert the normal link to a post request.

[franck]

Is the invalidity of this page really a problem?

[Nicolas <nikrou77@…>]

(In [89c91e538879]) Fix invalid html for media page (in attachment context) because of nested form. Closes #1761