Improve code compatibility

src/hash.hh

@@ -4,6 +4,8 @@
 #include <type_traits>
 #include <functional>
 
+#include <cstddef>
+
 namespace Kakoune
 {
 

src/main.cc

@@ -437,7 +437,7 @@ int run_filter(StringView keystr, ArrayView<StringView> files, bool quiet)
             try
             {
                 InputHandler input_handler{
-                    { buffer, {{0,0}, buffer.back_coord()} },
+                    { buffer, Selection{{0,0}, buffer.back_coord()} },
                     Context::Flags::Transient
                 };