Issue 4125 - [emscripten] Convert filter classes to C++

compiled/ActiveFilter.cpp

 #include <cstdio>
 
 #include "ActiveFilter.h"
 #include "StringScanner.h"
 
-static const DependentString DEFAULT_DOMAIN(u""_str);
-
 namespace
 {
+  const DependentString DEFAULT_DOMAIN(u""_str);
+
   OwnedString to_string(unsigned int i)
   {
     char buffer[11];
     int len = sprintf(buffer, "%u", i);
 
     OwnedString result(len);
     for (String::size_type i = 0; i < len; i++)
       result[i] = buffer[i];
     return result;
   }
@@ skipping 161 matching lines @@
     result.append(u'\n');
   }
   if (mLastHit)
   {
     result.append(u"lastHit="_str);
     result.append(to_string(mLastHit));
     result.append(u'\n');
   }
   return result;
 }