[NF] Add more when tests.

Belonging to [master]:
  - OpenModelica/OMCompiler#3009
  - #1150

Author: perost

flattening/modelica/scodeinst/Makefile

@@ -818,6 +818,7 @@ When2.mo \
 When3.mo \
 When4.mo \
 When5.mo \
+When6.mo \
 WhenClocked1.mo \
 WhenClockedElse1.mo \
 WhenClockedElse2.mo \

flattening/modelica/scodeinst/When6.mo

@@ -0,0 +1,53 @@
+// name: When6
+// keywords:
+// status: correct
+// cflags:   -d=newInst
+//
+//
+
+model When6
+  Real a, b, c, d, e, f;
+equation
+  when time > 0 then
+    a = 1;
+    b = 2;
+    c = 3;
+    d = 4;
+    e = 5;
+    f = 6;
+  elsewhen time > 1 then
+    c = 1;
+    e = 2;
+    a = 3;
+    b = 4;
+    f = 5;
+    d = 6;
+  end when;
+end When6;
+
+// Result:
+// class When6
+//   Real a;
+//   Real b;
+//   Real c;
+//   Real d;
+//   Real e;
+//   Real f;
+// equation
+//   when time > 0.0 then
+//     a = 1.0;
+//     b = 2.0;
+//     c = 3.0;
+//     d = 4.0;
+//     e = 5.0;
+//     f = 6.0;
+//   elsewhen time > 1.0 then
+//     c = 1.0;
+//     e = 2.0;
+//     a = 3.0;
+//     b = 4.0;
+//     f = 5.0;
+//     d = 6.0;
+//   end when;
+// end When6;
+// endResult