(core) Fix some bugs with ChoiceList in summary tables, and evaluation of lookups.

Summary:
Addresses several issues:
- Error 'Cannot modify summary group-by column' when changing Text ->
  ChoiceList in the presence of summary tables.
- Error 'ModifyColumn in unexpected position' when changing ChoiceList -> Text
  in the presence of summary tables.
- Double-evaluation of trigger formulas in some cases.

Fixes include:
- Fixed verification that summary group-by columns match the underlying ones,
  and added comments to explain.
- Avoid updating non-metadata lookups after each doc-action (early lookups
  generated extra actions to populate summary tables, causing the 'ModifyColumn
  in unexpected position' bug)
- When updating formulas, do update lookups first.
- Made a client-side tweak to avoid a JS error in case of some undos.

Solution to reduce lookups is based on https://phab.getgrist.com/D3069?vs=on&id=12445,
and tests for double-evaluation of trigger formulas are taken from there.

Add a new test case to protect against bugs caused by incorrect order of
evaluating #lookup columns.

Enhanced ChoiceList browser test to check a conversion scenario in the presence
of summary tables, previously triggering bugs.

Test Plan: Various tests added or enhanced.

Reviewers: alexmojaki

Reviewed By: alexmojaki

Subscribers: jarek

Differential Revision: https://phab.getgrist.com/D3184

sandbox/grist/test_lookups.py

@@ -399,7 +399,7 @@ return ",".join(str(r.id) for r in Students.lookupRecords(firstName=fn, lastName
     self.assertPartialOutActions(out_actions, {
       "calls": {
         # No calculations of anything Schools because nothing depends on the incomplete value.
-        "Students": {"#lookup#firstName:lastName": 2, "schoolIds": 1, "schoolCities": 1}
+        "Students": {"#lookup#firstName:lastName": 1, "schoolIds": 1, "schoolCities": 1}
       },
       "retValues": [7],
     })
@@ -408,7 +408,7 @@ return ",".join(str(r.id) for r in Students.lookupRecords(firstName=fn, lastName
     out_actions = self.add_record("Students", firstName="Chuck", lastName="Norris")
     self.assertPartialOutActions(out_actions, {
       "calls": {
-        "Students": {"#lookup#firstName:lastName": 2, "schoolIds": 1, "schoolCities": 1},
+        "Students": {"#lookup#firstName:lastName": 1, "schoolIds": 1, "schoolCities": 1},
         "Schools": {"bestStudentId": 1}
       },
       "retValues": [8],