Schematic Library Tables warns about "invalid source position for vertical gradient"

[pipe]

Opening the Schematic Library Tables fills the console with messages like this:

** (kicad:8723): WARNING **: invalid source position for vertical gradient

They are printed every time it is redrawn, for example by resizing the window.

It also happens with the PCB Library Tables, which contains a similar table. This is possibly a wxWidgets bug, but could also be a bug in how it is being used in KiCad.

Application: kicad
Version: (2017-11-18 revision ff5ee05de)-master, release build
Libraries:
    wxWidgets 3.0.3
    libcurl/7.56.1 OpenSSL/1.0.2m zlib/1.2.8 libidn2/2.0.2 libpsl/0.19.1 (+libidn2/2.0.2) libssh2/1.8.0 nghttp2/1.27.0 librtmp/2.3
Platform: Linux 4.13.0-1-amd64 x86_64, 64 bit, Little endian, wxGTK
Build Info:
    wxWidgets: 3.0.3 (wchar_t,wx containers,compatible with 2.8) GTK+ 2.24
    Boost: 1.62.0
    Curl: 7.56.1
    Compiler: GCC 7.2.0 with C++ ABI 1011

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=OFF
    BUILD_GITHUB_PLUGIN=ON
    KICAD_USE_OCE=OFF
    KICAD_SPICE=OFF

[Wayne Stambaugh (stambaughw)]

This is pretty typical on gtk+ builds. It is not a bug unless kicad crashes or you cannot use the UI due to any of these warnings.

[Nick Østergaard (nickoe)]

This is usually a bug in the gtk theme.