ICS was not updated properly after connecting atoms

modules/mol/base/src/editor_base.cc

@@ -217,6 +217,7 @@ void EditorBase::UpdateTrace()
 {
   if (mode_==UNBUFFERED_EDIT) {
     ent_.Impl()->TraceDirectionality();
+    ent_.Impl()->UpdateICSIfNeeded();
   }
 }
 

modules/mol/base/tests/test_ics.cc

@@ -103,6 +103,13 @@ bool test_angle(Real a, Real e) {
 
 BOOST_AUTO_TEST_SUITE( mol_base )
 
+BOOST_AUTO_TEST_CASE(ics_update_icsbondlength)
+{
+  TorsionStructure s;
+  mol::BondHandle bond = s.a2.FindBondToAtom(s.a3);
+  BOOST_CHECK_CLOSE(bond.GetLength(), 1.0, EPSILON);
+}
+
 BOOST_AUTO_TEST_CASE(ics_settorsion_unbuffered)
 {
   Real eps = 0.0001;