(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_derived.py

@@ -113,8 +113,8 @@ class TestDerived(test_engine.EngineTestCase):
       ],
       "calls": {
         "GristSummary_6_Orders": {'#lookup#year': 1, "group": 2, "amount": 2, "count": 2},
-        "Orders": {"#lookup##summary#GristSummary_6_Orders": 2,
-                   "#summary#GristSummary_6_Orders": 2}}
+        "Orders": {"#lookup##summary#GristSummary_6_Orders": 1,
+                   "#summary#GristSummary_6_Orders": 1}}
     })
 
     self.assertPartialData("GristSummary_6_Orders", ["id", "year", "count", "amount", "group" ], [
@@ -296,6 +296,6 @@ class TestDerived(test_engine.EngineTestCase):
         actions.UpdateRecord("Orders", 1, {"year": 2012}),
       ],
       "calls": {"GristSummary_6_Orders": {"group": 1, "amount": 1, "count": 1},
-                "Orders": {"#lookup##summary#GristSummary_6_Orders": 2,
-                           "#summary#GristSummary_6_Orders": 2}}
+                "Orders": {"#lookup##summary#GristSummary_6_Orders": 1,
+                           "#summary#GristSummary_6_Orders": 1}}
     })