Fix handling of ganged connections

org.lflang/src/org/lflang/generator/ReactorInstance.java

@@ -1060,8 +1060,14 @@ private List<RuntimeRange<PortInstance>> listPortInstances(
                 if (count < references.size() - 1) {
                     int portWidth = portInstance.width;
                     int portParentWidth = portInstance.parent.width;
+                    // If the port is being connected on the inside and there is
+                    // more than one port in the list, then we can only connect one
+                    // bank member at a time.
+                    if (reactor == this && references.size() > 1) {
+                        portParentWidth = 1;
+                    }
                     int widthBound = portWidth * portParentWidth;
-
+                                        
                     // If either of these widths cannot be determined, assume infinite.
                     if (portWidth < 0) widthBound = Integer.MAX_VALUE;
                     if (portParentWidth < 0) widthBound = Integer.MAX_VALUE;

test/C/src/multiport/BankGangedConnections.lf

@@ -0,0 +1,24 @@
+target C {
+    timeout: 0 sec
+}
+import Count from "../lib/Count.lf"
+import TestCount from "../lib/TestCount.lf"
+reactor Through {
+    input in:int;
+    output out:int;
+    reaction(in) -> out {=
+        SET(out, in->value);
+    =}
+}
+reactor Bank {
+    input in:int;
+    output out:int;
+    t = new Through();
+    in, t.out -> t.in, out;
+}
+main reactor {
+    b = new[2] Bank();
+    s = new Count();
+    t = new TestCount();
+    s.out, b.out -> b.in, t.in;
+}