To answer my own question, discovered Jinja2 Assignments
<http://jinja2.readthedocs.org/en/latest/templates.html#assignments>, so
you can "roll your own" ifchanged tag.
e.g.:
{$ for baz in foo %}
{% if baz.category != variable_watcher %}
{# Do whatever when there's been a change here. #}
{% baz.category %}
{% set variable_watcher = baz.category %}
{% else %}
{# Do whatever when there's no change here. #}
{% baz.category %}
{% endif %}
{% endfor %}
HTH,
John
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