fix: use area-acronym-at-the-time in proceedings (#7723)

When generating IETF meeting proceedings, use the Area Acronym for each WG at the time of the meeting. Fixes #7706.

ietf/meeting/views.py

@@ -4131,6 +4131,13 @@ def _format_materials(items):
 
 def proceedings(request, num=None):
 
+    def area_and_group_acronyms_from_session(s):
+        area = s.group_parent_at_the_time()
+        if area == None:
+            area = s.group.parent
+        group = s.group_at_the_time()
+        return (area.acronym, group.acronym)
+
     meeting = get_meeting(num)
 
     # Early proceedings were hosted on www.ietf.org rather than the datatracker
@@ -4181,12 +4188,11 @@ def proceedings(request, num=None):
         .exclude(current_status='notmeet')
     )
 
-    ietf = sessions.filter(group__parent__type__slug = 'area').exclude(group__acronym='edu').order_by('group__parent__acronym', 'group__acronym')
+    ietf = sessions.filter(group__parent__type__slug = 'area').exclude(group__acronym__in=['edu','iepg','tools'])
+    ietf = list(ietf)
+    ietf.sort(key=lambda s: area_and_group_acronyms_from_session(s))
     ietf_areas = []
-    for area, area_sessions in itertools.groupby(
-            ietf,
-            key=lambda s: s.group.parent
-    ):
+    for area, area_sessions in itertools.groupby(ietf, key=lambda s: s.group_parent_at_the_time()):
         meeting_groups, not_meeting_groups = organize_proceedings_sessions(area_sessions)
         ietf_areas.append((area, meeting_groups, not_meeting_groups))