PCBnew diff pair tune knotting

[Martin Thomas]

When I tune differential pair it starts knotting the lines when the spacing is close.

Application: Pcbnew
Version: (5.99.0-355-g695caa7df-dirty), release build
Libraries:
    wxWidgets 3.0.2
    libcurl/7.52.1 GnuTLS/3.5.8 zlib/1.2.8 libidn2/0.16 libpsl/0.17.0 (+libidn2/0.16) libssh2/1.7.0 nghttp2/1.18.1 librtmp/2.3
Platform: Linux 5.3.10-mt x86_64, 64 bit, Little endian, wxGTK
Build Info:
    Build date: Nov 12 2019 08:01:14
    wxWidgets: 3.0.2 (wchar_t,wx containers,compatible with 2.8) GTK+ 2.24
    Boost: 1.62.0
    OpenCASCADE Community Edition: 6.8.0
    Curl: 7.52.1
    Compiler: GCC 6.3.0 with C++ ABI 1010

Build settings:
    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

[Michael Kavanagh (michaelkavanagh)]

I'm not too familiar with this functionality, but the video sure looks bad.

Does this occur in 5.1.4/5.1.5 (soon to be released)? Can you upload an example PCB file (it could be a combination of the board setup)? What are your interactive router settings set to?

[Martin Thomas (mtlaunchpad)]

Ia have a simple board. It happens in the hirizontal lines wich are near together.