false-positive unreadVariable when variable is used in template

[Rob Deckers]

with Cppcheck 2.17 (and earlier) I get a false-positive
FilterTest.cpp:65:18: style: Variable 'window_size' is assigned a value that is never used. [unreadVariable]

TEST(FilterTest, MedianTest)
{
    const size_t window_size = 3;  // Odd number
    Filter::Median<double, window_size> median;
    // rest of test
  }

Median definition is

template <typename T, std::size_t WindowSize>
    requires(WindowSize % 2 != 0)
class Median : public IFilter<T>

[CHR]

Covered by https://trac.cppcheck.net/ticket/10233