nixos/sddm: remove stale qmlcache workaround

Changed files
-15
nixos
modules
services
x11
display-managers
-15
nixos/modules/services/x11/display-managers/sddm.nix
···
# To enable user switching, allow sddm to allocate TTYs/displays dynamically.
services.xserver.tty = null;
services.xserver.display = null;
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systemd.tmpfiles.rules = [
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# Prior to Qt 5.9.2, there is a QML cache invalidation bug which sometimes
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# strikes new Plasma 5 releases. If the QML cache is not invalidated, SDDM
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# will segfault without explanation. We really tore our hair out for awhile
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# before finding the bug:
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# https://bugreports.qt.io/browse/QTBUG-62302
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# We work around the problem by deleting the QML cache before startup.
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# This was supposedly fixed in Qt 5.9.2 however it has been reported with
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# 5.10 and 5.11 as well. The initial workaround was to delete the directory
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# in the Xsetup script but that doesn't do anything.
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# Instead we use tmpfiles.d to ensure it gets wiped.
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# This causes a small but perceptible delay when SDDM starts.
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"e ${config.users.users.sddm.home}/.cache - - - 0"
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];
};
}