Require window-size message loop for advance.

Author: evoskuil

src/chasers/chaser_check.cpp

@@ -341,8 +341,7 @@ size_t chaser_check::set_unassociated() NOEXCEPT
 
     // Defer new work issuance until gaps filled and confirmation caught up.
     if (position() < requested_ ||
-        requested_ >= maximum_height_
-        /*||confirmed_ < requested_*/)
+        confirmed_ < requested_)
         return {};
 
     // Inventory size gets set only once.