Custom pad with cirle primitive behaves strangely in compination with paste and mask margin

[Rene Poeschl]

I am currently creating a python abstraction for ring pads similar to the ones needed for these parts: https://katalog.we-online.de/em/datasheet/9776100960.pdf

While experimenting with it i discovered that paste margin behaves very strange when creating a ring like pad from a circle primitive plus a circular anchor.

Positive paste margin setting results in the hole being ignored (paste looks like the outer diameter of the ring represented a circular pad)

A negative clearance does not result in a ring like paste layer but in an arc.

The mask layer behaves exactly the same as the paste layer with positive margin. Negative margin does not seem to be allowed as i get an error message for it.

---

Additional note: One can not see paste with the default color settings (as it has the same color as copper) i therefor used this one: https://github.com/pointhi/kicad-color-schemes/tree/master/blue-green-dark (One of the main goals of it was to make footprint development easier)

---

Application: kicad
Version: 5.1.2-f72e74a~84~ubuntu16.04.1, release build
Libraries:
    wxWidgets 3.0.2
    libcurl/7.47.0 OpenSSL/1.0.2g zlib/1.2.8 libidn/1.32 librtmp/2.3
Platform: Linux 4.15.0-48-generic x86_64, 64 bit, Little endian, wxGTK
Build Info:
    wxWidgets: 3.0.2 (wchar_t,wx containers,compatible with 2.8) GTK+ 2.24
    Boost: 1.58.0
    OpenCASCADE Community Edition: 6.8.0
    Curl: 7.47.0
    Compiler: GCC 5.4.0 with C++ ABI 1009

Build settings:
    USE_WX_GRAPHICS_CONTEXT=OFF
    USE_WX_OVERLAY=OFF
    KICAD_SCRIPTING=ON
    KICAD_SCRIPTING_MODULES=ON
    KICAD_SCRIPTING_PYTHON3=OFF
    KICAD_SCRIPTING_WXPYTHON=ON
    KICAD_SCRIPTING_WXPYTHON_PHOENIX=OFF
    KICAD_SCRIPTING_ACTION_MENU=ON
    BUILD_GITHUB_PLUGIN=ON
    KICAD_USE_OCE=ON
    KICAD_USE_OCC=OFF
    KICAD_SPICE=ON