(core) Fix reporting of errors when saving cells by clicking away, and deduplicate memos.

Test Plan: Enhanced the test case for memos to check these cases too (fails without this fix).

Reviewers: paulfitz

Reviewed By: paulfitz

Differential Revision: https://phab.getgrist.com/D2876

app/client/widgets/FieldEditor.ts

@@ -443,8 +443,10 @@ function setupReadonlyEditorCleanup(
  * - Arrange for UnsavedChange protection against leaving the page with unsaved changes.
  */
 function setupEditorCleanup(
-  owner: MultiHolder, gristDoc: GristDoc, field: ViewFieldRec, saveEdit: () => Promise<unknown>
+  owner: MultiHolder, gristDoc: GristDoc, field: ViewFieldRec, _saveEdit: () => Promise<unknown>
 ) {
+  const saveEdit = () => _saveEdit().catch(reportError);
+
   // Whenever focus returns to the Clipboard component, close the editor by saving the value.
   gristDoc.app.on('clipboard_focus', saveEdit);