New custom components not rendered after programmatically updating Spreadsheet

New custom components are not rendered after programmatically changing cell values before first user action in Spreadsheet that requires client to server interaction (e.g. selecting more than 1 cell, or opening and closing a cell editor in UI).
spreadsheet.refreshAllCellValues() etc. do not help. Only a full re-render (spreadsheet.reload()) makes them appear correctly, which pretty heavy for large sheets.

Vaadin version: 7.7.9
Spreadsheet version: 1.3.4
Browsers:
at least Chrome, Firefox, Edge, IE on Windows 10
at least Chrome on Mac

Attached minimal example app. To reproduce:

1. mvn jetty:run in project root, open localhost:8080 in browser,
2. click on Button 'Click to add new row of data',
3. new data row is added,
4. custom component ('Edit' Button) not visible, only its 'normal' filler cell value
5. select more than one cell, or change a cell's value -> Button is rendered

spreadsheet-issue-629.zip

Start with the attached minimal example app and run mvn jetty:run from its project root. Reproduce the missing custom component after adding a row, then compare the behavior of refreshAllCellValues() with reload() and with the first client-server interaction; done means the new custom component appears without a full spreadsheet reload.