Hi,
When the main vendor would edit his products like in the backend, such redirection would not be required.
I think we could had an option in order to let the vendor on the same page, redirect the vendor to the product page or to a "product preview" page, redirect the vendor to a specific/thank you page.
(Feature request added in our TODO list)
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.