Uninstalling Design456 WB solved the redundant tabs issue in Prefs>Import/Export.

[MariwanJ]

as per this page
https://forum.freecadweb.org/viewtopic.php?f=3&t=70029&p=608101&hilit=design456#p608101
I don't have any linux box. But I found another issue in one file and fixed by 59ee077
I need to investigate where this happen

[MariwanJ]

Issue found at the InitGui.py. I was adding the same what Draft added to the preferences. Never thought about that.
Bug is fixed by 686bf7d

[MariwanJ]

I keep this just to let FreeCAD people know that the issue is fixed.

[MariwanJ]

Bug is fixed and announced. close the issue.

[luzpaz]

Did the change ever make it to the live branch ? We just saw this bug in a ticket 👆

[MariwanJ]

yes. you can look at the file in main if you want. Bugs people report, I do change the main directly.

[luzpaz]

Design456/Design456Init.py

Lines 68 to 73 in be31466

	App.addImportType("BREP format (*.brep *.brp)", "Part")
	App.addExportType("BREP format (*.brep *.brp)", "Part")
	App.addImportType("IGES format (*.iges *.igs)", "Part")
	App.addExportType("IGES format (*.iges *.igs)", "Part")
	App.addImportType("STEP with colors (*.step *.stp)", "Import")
	App.addExportType("STEP with colors (*.step *.stp)", "Import")

@MariwanJ is the duplication here necessary ?

[MariwanJ]

It is a copy of what you find in Draft. Shouldn't affect FC. I do that only in my WB ..
I need to import DRAFT to Design456.

[luzpaz]

@MariwanJ it's affecting FC per the bug FreeCAD/FreeCAD#15997 (see the screenshots)

[MariwanJ]

@luzpaz
Bug fixed by 320b7e6
Thanks for reporting