/**
* This will add the fallback value (val field after save) to the display fields component,
* so it can be saved by @GridFieldEditableColumns
*
* @param GridField $grid
* @param GridFieldDataColumns $editable
*/
private function addFallbackValueToDisplayFields(GridField $grid, GridFieldDataColumns $editable)
{
$fields = $editable->getDisplayFields($grid);
if (!isset($fields[$this->valFieldAfterSave])) {
$editable->setDisplayFields($fields + [$this->valFieldAfterSave => $this->valFieldAfterSave]);
}
}