Smart way to keep input data after form success

Hi all,
I'm looking for the smartest way to repopulate a form after a success submit. My use-case is a search form, for which the more convenient for users is to have their last search param kept in the input fields.

Of course I can do it by myself passing the value to the view, but I was wondering if there is something like the set_value() function that I can use in my case.

Thanks in advance,
ponsfrilus

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