Make the snapping modifier key user changeable

I cannot reproduce this. @Rene, can you try with a nightly 5.1 build?

Application: ModEdit
Version: (5.1.4-52-g4500b064d), debug build
Libraries:
    wxWidgets 3.0.4
    libcurl/7.64.0 OpenSSL/1.1.1c zlib/1.2.11 libidn2/2.0.5 libpsl/0.20.2 (+libidn2/2.0.5) libssh2/1.8.0 nghttp2/1.36.0 librtmp/2.3
Platform: Linux 4.19.0-5-amd64 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: 7.64.0
    Compiler: GCC 8.3.0 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

I am on fedora. I am not aware of 5.1 nightlies for this platform.

@Rene, I think this is a window manager issue. I saw this on Mate when the window settings used Alt+Click to move the window. When that happens, KiCad never receives the mouse event for the click. Can you check in the window settings of your system to see if it uses Alt (I believe this is also in Gnome) and try changing it to the super key?

You might be right with your assumption. But i am not sure if it is a good idea to require the operating system (or a part of it) to change around a program. Can the function of the alt key be mapped to another key somewhere within kicad? (I could not find it in the hotkey list)

No, currently there is no way for a user to modify the snapping modifier key.

KiCad bug tracker has moved to Gitlab. This report is now available here: https://gitlab.com/kicad/code/kicad/-/issues/2495