Fix unit test

pylene/include/mln/core/image/view/filter.hpp

@@ -32,12 +32,10 @@ namespace mln
 
     class domain_type : ::ranges::view_base
     {
-      using pred_t = ::ranges::semiregular_t<F>;
-      using fun_t  = ::ranges::composed<pred_t, std::reference_wrapper<I>>; // f o I::operator()
-      using dom_t  = decltype(std::declval<I*>()->domain());
-      using rng_t  = mln::ranges::remove_if_view<::ranges::view::all_t<dom_t>, ::ranges::logical_negate<fun_t>>;
+      using fun_t = ::ranges::composed<F, std::reference_wrapper<I>>; // f o I::operator()
+      using dom_t = decltype(std::declval<I*>()->domain());
+      using rng_t = mln::ranges::remove_if_view<::ranges::view::all_t<dom_t>, ::ranges::logical_negate<fun_t>>;
 
-      pred_t        m_pred;
       fun_t         m_fun;
       dom_t         m_dom;
       mutable rng_t m_rng; // domain can be a range, so non-const
@@ -50,8 +48,7 @@ namespace mln
       using reference  = ::ranges::range_reference_t<rng_t>;
 
       domain_type(I* ima, F f)
-        : m_pred(std::move(f))
-        , m_fun(m_pred, std::ref(*ima))
+        : m_fun(std::move(f), std::ref(*ima))
         , m_dom(ima->domain())
         , m_rng(mln::ranges::view::filter(::ranges::view::all(m_dom), m_fun))
       {