Spreadsheet `change` event is not triggered

[mbechev]

Describe the bug When deleting or inserting a row/column and when changing the color of the cell content, the change event is not triggered.

To Reproduce Delete or insert a row or change the format of the cell. No events are fired: https://stackblitz.com/edit/angular-puqrxi

[slavenai]

The formatChange event is triggered as expected when changing the cells' format using the tool:

The change event is not triggered when deleting or inserting columns/rows, but when the changes are reverted (using the Undo tool), the event is emitted.