How to increase the number in notification

hi all
now if the number in notification more than 99 the notification display +99
i want to make it up to 999
and if i modified this file
frappe/frappe/blob/develop/frappe/public/js/frappe/ui/toolbar/notifications.js#L45
will i lost the modified code after update ?

Hi, You won’t be able to do bench update with changes in frappe, erpnext. Consider raising a PR.
Thanks

if you commit your changes it will not lost while updates