Comment 0 for bug 1796596

Trying to open a kicad_pcb from old-stable in the 5.0 branch fails.

The test file is
https://raw.githubusercontent.com/myriadrf/reference-development-kit/master/umyriadrf-7002/v2/KiCAD/uMyriad7002.kicad_pcb

Inspired by the info from http://kicad-pcb.org/help/upgrading/ about the layer names. It looks like some layers are missing in the top of the file.

I manually added
(10 Inner10.Cu signal)
(9 Inner9.Cu signal)
(8 Inner8.Cu signal)
(7 Inner7.Cu signal)

The question is: Do we need to implement some, legacy logic to handle these files? Maybe an experimental file healer for know issues?

Application: pcbnew
Version: (5.0.1-dev-152-gf591f8741), release build
Libraries:
    wxWidgets 3.0.4
    libcurl/7.61.1 OpenSSL/1.1.1 zlib/1.2.11 libidn2/2.0.5 libpsl/0.20.2 (+libidn2/2.0.4) libssh2/1.8.0 nghttp2/1.33.0
Platform: Linux 4.18.12-arch1-1-ARCH x86_64, 64 bit, Little endian, wxGTK
Build Info:
    wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8) GTK+ 2.24
    Boost: 1.68.0
    OpenCASCADE Technology: 7.3.0
    Curl: 7.61.1
    Compiler: GCC 8.2.1 with C++ ABI 1013

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