Pcbnew: Scaling issue

[Daniel Giesbrecht]

Attached is a PNG screen-shot of Pcbnew.

System information:
- OS: Ubuntu 18.10
- Display resolution: 3840x2160, 200% scaling

KiCad (5.1-stable) version information can be found at the bottom of this report.

The working area of Pcbnew (containing white dotted grid) is scaled to the bottom-left 1/4 of the screen. Placing my mouse pointer at the top-right of my screen puts the cross-hair in the middle. As I move my mouse pointer to the bottom-left corner, the cross-hair and mouse pointer converge. This happens when using Modern Toolset (Accelerated), but not Modern Toolset (Fallback).

Workarounds:
- Changing my display resolution to 1920x1080 fixes the problem (for both modern toolsets).
- Changing scaling to 100% (and maintaining 4K resolution) fixes the problem (for both modern toolsets).

KiCad version information:

Application: kicad
Version: 5.1.0-060a0da~80~ubuntu18.10.1, release build
Libraries:
    wxWidgets 3.0.4
    libcurl/7.61.0 OpenSSL/1.1.1 zlib/1.2.11 libidn2/2.0.5 libpsl/0.20.2 (+libidn2/2.0.4) nghttp2/1.32.1 librtmp/2.3
Platform: Linux 4.18.0-16-generic x86_64, 64 bit, Little endian, wxGTK
Build Info:
    wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.24
    Boost: 1.67.0
    OpenCASCADE Community Edition: 6.9.1
    Curl: 7.61.0
    Compiler: GCC 8.2.0 with C++ ABI 1013

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

[Michael Kavanagh (michaelkavanagh)]

Looks like https://bugs.launchpad.net/kicad/+bug/1797308. Have a read through that comment thread, it could be a duplicate.