Handle FILTHY tag when unloading/reloading items (#37927)

src/activity_handlers.cpp

@@ -1879,13 +1879,20 @@ void activity_handlers::reload_finish( player_activity *act, player *p )
     const int qty = act->index;
     const bool is_speedloader = ammo.has_flag( flag_SPEEDLOADER );
     const bool is_bolt = ammo.ammo_type() == ammo_bolt;
+    const bool reloadable_is_filthy = reloadable.is_filthy();
+    const bool ammo_is_filthy = ammo.is_filthy();
 
     if( !reloadable.reload( *p, std::move( act->targets[ 1 ] ), qty ) ) {
         add_msg( m_info, _( "Can't reload the %s." ), reloadable.tname() );
         return;
     }
 
     std::string msg = _( "You reload the %s." );
+
+    if( ammo_is_filthy ) {
+        reloadable.set_flag( "FILTHY" );
+    }
+
     if( reloadable.get_var( "dirt", 0 ) > 7800 ) {
         msg =
             _( "You manage to loosen some debris and make your %s somewhat operational." );

src/player.cpp

@@ -3773,6 +3773,9 @@ bool player::unload( item &it )
 
         // Construct a new ammo item and try to drop it
         item ammo( target->ammo_current(), calendar::turn, qty );
+        if( target->is_filthy() ) {
+            ammo.set_flag( "FILTHY" );
+        }
 
         if( ammo.made_of_from_type( LIQUID ) ) {
             if( !this->add_or_drop_with_msg( ammo ) ) {