gcode-preview - v3.0.0-alpha.6
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    setAbsoluteExtrusion: CommandHandler = ...

    Executes an M82 command, switching E parameters to absolute positions

    GCodeCommand (no parameters used)

    Job instance to update

    Only the E accounting (State.applyExtrusion) consults the mode; whether a move extrudes is still classified from the raw E parameter. Cura emits M82 or M83 right after its start gcode, which is what keeps the volumetric dimension derivation's extruded lengths correct in either mode.