_changelist_filters is lost

[manelclos]

Hi,

I noticed _changelist_filters is not preserved in the "add" button, probably somewhere else too. This breaks both navigation and my app.

Thanks!

[xrmx]

Indeed, for reference this is what django has in master, problem is that has been added in 1.6 django/django@c86a9b6 and we support django >= 1.4

templates/admin/change_form.html:        <a href="{% add_preserved_filters history_url %}" class="historylink">{% trans "History" %}</a>
templates/admin/change_list.html:              <a href="{% add_preserved_filters add_url is_popup to_field %}" class="addlink">
templates/admin/submit_line.html:    <p class="deletelink-box"><a href="{% add_preserved_filters delete_url %}" class="deletelink">{% trans "Delete" %}</a></p>

[manelclos]

Yes, and it is a must-have feature. Is there a way to check for the existence of a tag?