(core) Improve highlighting of previewed formula

Summary:
Also improves highlighting of columns when the "Click to insert"
tooltip is shown, and improves highlighting of transforming columns.

Test Plan: Manual.

Reviewers: paulfitz

Reviewed By: paulfitz

Differential Revision: https://phab.getgrist.com/D3962

app/client/models/entities/ViewFieldRec.ts

@@ -253,6 +253,7 @@ export function createViewFieldRec(this: ViewFieldRec, docModel: DocModel): void
   });
 
   this.tableId = ko.pureComputed(() => this.column().table().tableId());
+  this.rulesList = ko.pureComputed(() => this._fieldOrColumn().rules());
   this.rulesCols = refListRecords(docModel.columns, ko.pureComputed(() => this._fieldOrColumn().rules()));
   this.rulesColsIds = ko.pureComputed(() => this.rulesCols().map(c => c.colId()));
   this.rulesStyles = modelUtil.fieldWithDefault(