Differential Pair Length tuning can create odd shapes when constrained

[Seth Hillbrand]

When you tune a differential pair for length, the shapes generated can end up being very odd (looping back on themselves) when the space for the shape is constrained. See attached video for an example.

Application: kicad
Version: (5.0.0-rc2-dev-677-gad6956b05), release build
Libraries:
    wxWidgets 3.0.2
Platform: Linux 4.9.0-6-amd64 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: 1.62.0
    Compiler: GCC 6.3.0 with C++ ABI 1010

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

[Seth Hillbrand (sethh)]

See duplicate for additional example

[KiCad Janitor (kicad-janitor)]

KiCad bug tracker has moved to Gitlab. This report is now available here: https://gitlab.com/kicad/code/kicad/-/issues/1776