Expandable connectors: wrong equations generation in Multibody

[Bruno Scaglioni]

While testing multibody library for MSL 3.2.1 I disovered that the example systems.oneAxis don't simulate anymore (MSL 3.1 simulates) because the flattened model has more equations then variables.

Class Modelica.Mechanics.MultiBody.Examples.Systems.RobotR3.oneAxis has 445 equation(s) and 500 variable(s).
329 of these are trivial equation(s).

Exploring the flattened code from 3.1 and 3.2.1 i discovered that inside controlBus model all the equations of the six axisControlBus
are activated nevertheless only variables of axisControlBus1 are assigned (look at PathPlanning1 model), so, referring to Modelica Specification 3.2 rev1 only equations with a matching variables should be activated.

This happens in MSL 3.2.1 because controlBus model containing the six axisControlBus does not expand anymore an empty controlBus model but in 3.2.1 only the controlBus within six axisControlBus exist. However the models are compliant to the 3.2 rev 1 Specific and they simulate correctly in Dymola, so this should be fixed.

[Bruno Scaglioni]

Flat model of MSL 3.1

[Bruno Scaglioni]

Flat model of 3.2.1

[Adrian Pop]

Hopefully fixed in r13313. Added test in r13314.

[Adrian Pop]

I'll wait until the testsuite finishes until I close this bug.