[filelight] [Bug 502709] Pie chart on the right is invisible with Qt 6.9, NVIDIA graphics, and Filelight running as a Wayland application

[pallaswept]

https://bugs.kde.org/show_bug.cgi?id=502709

--- Comment #23 from pallaswept <pallaswept at proton.me> ---
Thank you for the tip that this was specific to nvidia/Wayland. I help support
a qtwebengine app which has seen issues with this lately (Qt 6.9 and nvidia
have not been fully working yet) so it's suddenly very familiar.

Be advised that the nvidia vulkan drivers (all of them currently available)
have a bug regarding excessive CPU utilisation, so you probably don't want to
set your system up to use it globally.

Since this is Wayland-specific, we can work around this with an environment
variable, and run it in XWayland until it's fixed:

QT_QPA_PLATFORM=xcb filelight

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