issue when using \operatorname

[HMegh]

Hi,

I was trying to use PGFPlotsX with LaTeXStrings (for my labels) but I encountered an issue. For instance

using Plots, LaTeXStrings
pgfplotsx()
plot(z->sinc(z),0,1,label=L"\operatorname{sinc}(z)")

returns an error ! Undefined control sequence. <recently read> \operatorname (full error message is at the end). The same code works as expected with GR as a backend. Currently, I am using Plots v1.40.8 and PGFPlotsX v1.6.2.

The error message

! Undefined control sequence.
<recently read> \operatorname 
              
l.84 \end{axis}
             
Error showing value of type Plots.Plot{Plots.PGFPlotsXBackend}:
ERROR: The latex command `lualatex jl_f8nu94F6Fu.tex` failed
Stacktrace:
  [1] error(s::String)
    @ Base ./error.jl:35
  [2] savepdf(filename::String, td::PGFPlotsX.TikzDocument; latex_engine::PGFPlotsX.LaTeXEngine, buildflags::Vector{…}, run_count::Int64, tmp::String)
    @ PGFPlotsX ~/.julia/packages/PGFPlotsX/XcmEC/src/tikzdocument.jl:202
  [3] savepdf
    @ ~/.julia/packages/PGFPlotsX/XcmEC/src/tikzdocument.jl:159 [inlined]
  [4] save(filename::String, td::PGFPlotsX.TikzDocument; include_preamble::Bool, latex_engine::PGFPlotsX.LaTeXEngine, buildflags::Vector{…}, dpi::Int64, showing_ide::Bool)
    @ PGFPlotsX ~/.julia/packages/PGFPlotsX/XcmEC/src/tikzdocument.jl:86
  [5] save(filename::String, td::PGFPlotsX.TikzDocument)
    @ PGFPlotsX ~/.julia/packages/PGFPlotsX/XcmEC/src/tikzdocument.jl:67
  [6] display(d::PGFPlotsX.PGFPlotsXDisplay, p::PGFPlotsX.TikzDocument)
    @ PGFPlotsX ~/.julia/packages/PGFPlotsX/XcmEC/src/tikzdocument.jl:355
  [7] _display(plt::Plots.Plot{Plots.PGFPlotsXBackend})
    @ Plots ~/.julia/packages/Plots/kLeqV/src/backends/pgfplotsx.jl:1386
  [8] display(::Plots.PlotsDisplay, plt::Plots.Plot{Plots.PGFPlotsXBackend})
    @ Plots ~/.julia/packages/Plots/kLeqV/src/output.jl:169
  [9] display(x::Any)
    @ Base.Multimedia ./multimedia.jl:340
 [10] #invokelatest#2
    @ ./essentials.jl:1055 [inlined]
 [11] invokelatest
    @ ./essentials.jl:1052 [inlined]
 [12] print_response(errio::IO, response::Any, show_value::Bool, have_color::Bool, specialdisplay::Union{…})
    @ REPL ~/.julia/juliaup/julia-1.11.1+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:409
 [13] (::REPL.var"#70#71"{REPL.LineEditREPL, Pair{Any, Bool}, Bool, Bool})(io::Any)
    @ REPL ~/.julia/juliaup/julia-1.11.1+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:378
 [14] with_repl_linfo(f::Any, repl::REPL.LineEditREPL)
    @ REPL ~/.julia/juliaup/julia-1.11.1+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:661
 [15] print_response(repl::REPL.AbstractREPL, response::Any, show_value::Bool, have_color::Bool)
    @ REPL ~/.julia/juliaup/julia-1.11.1+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:376
 [16] (::REPL.var"#do_respond#96"{…})(s::REPL.LineEdit.MIState, buf::Any, ok::Bool)
    @ REPL ~/.julia/juliaup/julia-1.11.1+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:1003
 [17] #invokelatest#2
    @ ./essentials.jl:1055 [inlined]
 [18] invokelatest
    @ ./essentials.jl:1052 [inlined]
 [19] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
    @ REPL.LineEdit ~/.julia/juliaup/julia-1.11.1+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/LineEdit.jl:2755
 [20] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
    @ REPL ~/.julia/juliaup/julia-1.11.1+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:1471
 [21] (::REPL.var"#75#81"{REPL.LineEditREPL, REPL.REPLBackendRef})()
    @ REPL ~/.julia/juliaup/julia-1.11.1+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:480
Some type information was truncated. Use `show(err)` to see complete types.

Julia version info

 Julia Version 1.11.1
Commit 8f5b7ca12ad (2024-10-16 10:53 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 20 × 12th Gen Intel(R) Core(TM) i9-12900H
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, alderlake)
Threads: 1 default, 0 interactive, 1 GC (on 20 virtual cores)
Environment:
  JULIA_LOAD_PATH = /usr/share/gmsh/api/julia:
  JULIA_EDITOR = vim

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