FEM: Bug when pre-selecting geometries for some constraints

[FEA-eng]

Is there an existing issue for this?

• I have searched the existing issues

Problem description

Easiest way to reproduce:

1. Create a Cube (Part Box).
2. Add an Analysis container.
3. Select one of the electromagnetic constraints like Electrostatic potential.
4. Don't press Add first, just select a face instead and then press Add. Click Ok.
5. Go back to this constraint or add any other one (even Force) and try the proper selection order - press Add and click on a Face. The following message will appear:

Selection Box: Face6 is in reference list already!

From now on, you won't be able to apply any constraint to any face until you restart FreeCAD (it keeps failing even in a separate document).

It's possible that any constraint with this selection order (clicking Add first) may cause this but I'm not sure about it and electromagnetic constraints are certainly triggering it.

@marioalexis84 FYI

Full version info

OS: Windows 10 build 19045
Word size of FreeCAD: 64-bit
Version: 0.22.0dev.37302 (Git)
Build type: Release
Branch: main
Hash: 0e24e121eb3e5708c380596e0a9fd583befac977
Python 3.11.9, Qt 5.15.13, Coin 4.0.2, Vtk 9.2.6, OCC 7.7.2
Locale: Polish/Poland (pl_PL)

Subproject(s) affected?

FEM

Anything else?

No response

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