[Fixed]-Inclusion templatetag with counter

I suggest putting your counter in request. Something like this.

# This code wasn't checked
@register.inclusion_tag('tagtemplate.html', takes_context=True)
def my_tag(context):
    request = context.get('request')
    counter = getattr(request, 'tag_counter', 0)
    request.tag_counter = counter + 1
    context['request'] = request
    return context