Stop bed filling if enough instances are generated

src/libslic3r/Arrange.hpp

@@ -83,7 +83,8 @@ struct ArrangeParams {
     
     /// Progress indicator callback called when an object gets packed. 
     /// The unsigned argument is the number of items remaining to pack.
-    std::function<void(unsigned)> progressind;
+    /// Second is the current bed idx being filled.
+    std::function<void(unsigned, unsigned /*bed_idx*/)> progressind;
     
     /// A predicate returning true if abort is needed.
     std::function<bool(void)>     stopcondition;