format_to_n not respecting max size

[TheAnswer]

#include <iostream>
#include <fmt/format.h>

int main()
{
std::vector<char> test;

const auto insertResult = fmt::format_to_n(std::back_inserter(test), 4, "{}", "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua");

std::cout << test.size() << " " << insertResult.size << std::endl;

return 0;
}

The above code hangs or if it succeeds, and you use a static sized buffer it will write over the max size corrupting the buffer.

This behaviour started with fmt 7.1.0, versions below that work fine.

Experiencing this issue in MSVC Version 16.7.7 and gcc 8.1

https://godbolt.org/z/eGEM9s

Program returned: 143

Killed - processing time exceeded

Works fine with fmt 7.0.0

https://godbolt.org/z/1MzY4Y

[vitaut]

Works as expected on master printing:

4 122

Could be related to #1996 which is already fixed.