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OS: Windows 8.1 (6.3) Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.19.20980 (Git) Build type: Release Branch: master Hash: c2818d9159385d23b182dc7167af2d4bacbee94c Python version: 3.6.8 Qt version: 5.12.1 Coin version: 4.0.0a OCC version: 7.3.0 Locale: Dutch/Netherlands (nl_NL)
Yes, before your pr for Bottom fix. And this bug is from FC 0.18.4/Win10x64.
Normally, such operation will create a "positive" normal face toward observers eyes. This bug produce a "negative" normal face toward observer's eyes.
Honestly, the problem could be under piles of code in the WorkingPlane module, the DraftGui module, the gui_snapper module, etc. I can't pinpoint the problem easily. I would have to dedicate many hours to find out what calls what because I don't have a clear idea of this.