Data Exchange, Step Import - xstep.cascade.unit doesn't work [regression since OCCT 7.6.0]

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Author: atychini
Date: Fri Jan 21 21:55:45 2022 +0300

    0032748: Data Exchange, Step Import - xstep.cascade.unit doesn't work [regression since OCCT 7.6.0]
    Added new condition in STEPControl_ActorRead::Transfer: if StepData_StepModel is not an initialized Unit - we set unit to this step model

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Dear Author,
please review branch CR32748

All tests are OK, see:
http://jenkins-test-08.nnov.opencascade.com/view/CR32748-master-atychini/view/COMPARE/

I have minor remark:

1622   XSAlgo::AlgoContainer()->PrepareForTransfer();

+  if (!aStepModel->IsInitializedUnit())
+  {
+    XSAlgo::AlgoContainer()->PrepareForTransfer(); // update unit info
+    aStepModel->SetLocalLengthUnit(UnitsMethods::GetCasCadeLengthUnit());
+  }

I think there should be only one preparation,

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Commenter 4, do we have this problem only in STEP translator, or maybe we should check IGES / Products as well?

> STEPControl_ActorRead.cxx

Iges and other DE OCCT components are protected from this problem. But there are PROD components with the same problem and they need to be fixed (DXF, Parasolid all components based on XS interface)

Dear Commenter 1,
please integrate. The current bug is fixed.

OCCT: CR32748
PROD: NOT

Combination -
OCCT branch : [archived branch]
master SHA - [revision removed]
[revision removed]
Products branch : [archived branch] SHA - [revision removed]
was compiled on Linux, MacOS and Windows platforms and tested in optimize mode.

Number of compiler warnings:
No new/fixed warnings

Regressions/Differences/Improvements:
No regressions/differences

CPU differences:
Debian80-64:
OCCT
Total CPU difference: 18541.880000000696 / 18411.29000000044 [+0.71%]
Products
Total CPU difference: 11695.81000000013 / 11647.290000000106 [+0.42%]
Windows-64-VC14:
OCCT
Total CPU difference: 20349.546875 / 20285.25 [+0.32%]
Products
Total CPU difference: 13126.203125 / 13132.546875 [-0.05%]


Image differences :
No differences that require special attention

Memory differences :
No differences that require special attention

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