For the ctests, we put the following into preferences:

  \converter "pdflatex" "pdf2" "pdflatex -shell-escape $$i" 
"latex=pdflatex,hyperref-driver=pdftex"

If I export on the GUI, I get a reasonable warning. But if I export on
the command-line something goes wrong with Qt6, but not Qt5 for some
reason. Presumably the issue is that LyX tries to give the warning but
there's no GUI since it's a command-line export.

Attached is the backtrace.

Can anyone reproduce with Qt6? To reproduce, put the above \coverter
command in the user directory preferences file, then do a command line
export (e.g., "-e pdf2 <file.lyx>").

Scott
(gdb) bt
#0  QVariant::QVariant (this=<optimized out>, val=..., this=<optimized out>, 
val=...) at /usr/src/qt6-base-6.4.2+dfsg-6/src/corelib/kernel/qvariant.cpp:825
#1  0x00007ffff71b8148 in standardDeclarationForNode (node=...) at 
/usr/src/qt6-base-6.4.2+dfsg-6/src/corelib/tools/qlist.h:123
#2  0x00007ffff717b4ab in QTextHtmlParser::declarationsForNode (node=<optimized 
out>, this=<optimized out>) at 
/usr/src/qt6-base-6.4.2+dfsg-6/src/gui/text/qtexthtmlparser.cpp:2140
#3  QTextHtmlParser::parseTag (this=<optimized out>) at 
/usr/src/qt6-base-6.4.2+dfsg-6/src/gui/text/qtexthtmlparser.cpp:676
#4  QTextHtmlParser::parse (this=<optimized out>) at 
/usr/src/qt6-base-6.4.2+dfsg-6/src/gui/text/qtexthtmlparser.cpp:606
#5  QTextHtmlParser::parse (_resourceProvider=<optimized out>, text=..., 
this=<optimized out>) at 
/usr/src/qt6-base-6.4.2+dfsg-6/src/gui/text/qtexthtmlparser.cpp:549
#6  QTextHtmlImporter::QTextHtmlImporter (this=<optimized out>, _doc=<optimized 
out>, _html=..., mode=<optimized out>, resourceProvider=<optimized out>, 
this=<optimized out>, 
    _doc=<optimized out>, _html=..., mode=<optimized out>, 
resourceProvider=<optimized out>) at 
/usr/src/qt6-base-6.4.2+dfsg-6/src/gui/text/qtextdocumentfragment.cpp:456
#7  0x00007ffff716470d in QTextDocument::setHtml (this=0x7fffffff6ff0, 
html=...) at /usr/src/qt6-base-6.4.2+dfsg-6/src/gui/text/qtextdocument.cpp:1270
#8  0x00005555564cf94c in lyx::qtHtmlToPlainText (text=...) at 
/home/scott/lyxbuilds/master-master/repo/src/frontends/qt/qt_helpers.cpp:794
#9  0x00005555563d5cd9 in lyx::frontend::Alert::toPlainText (
    msg=L"<p>The following LaTeX backend has been configured to allow execution 
of external programs for any document:</p><center><p><tt>pdflatex -shell-escape 
$$i</tt></p></center><p>This is a dangerous config"...) at 
/home/scott/lyxbuilds/master-master/repo/src/frontends/qt/GuiAlert.cpp:74
#10 0x00005555563d6be0 in lyx::frontend::Alert::doError (title=L"Security 
Warning", 
    message=L"<p>The following LaTeX backend has been configured to allow 
execution of external programs for any document:</p><center><p><tt>pdflatex 
-shell-escape $$i</tt></p></center><p>This is a dangerous config"..., 
backtrace=false) at 
/home/scott/lyxbuilds/master-master/repo/src/frontends/qt/GuiAlert.cpp:225
#11 0x00005555563d9c95 in std::__invoke_impl<void, void 
(*&)(std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, bool), 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, bool&> (
    __f=@0x55555702f1d0: 0x5555563d6b30 
<lyx::frontend::Alert::doError(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)>, __args=@0x7fffffff757f: false, 
__args=@0x7fffffff757f: false, __args=@0x7fffffff757f: false)
    at 
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/invoke.h:61
#12 0x00005555563d9bbd in std::__invoke<void 
(*&)(std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, bool), 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, bool&> (
    __fn=@0x55555702f1d0: 0x5555563d6b30 
<lyx::frontend::Alert::doError(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)>, __args=@0x7fffffff757f: false, 
__args=@0x7fffffff757f: false, __args=@0x7fffffff757f: false)
    at 
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/invoke.h:96
#13 0x00005555563d9b87 in std::_Bind<void 
(*(std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<bool>))(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)>::__call<void, , 0ul, 1ul, 
2ul>(std::tuple<>&&, std::_Index_tuple<0ul, 1ul, 2ul>) (this=0x55555702f1d0, 
__args=...) at 
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/functional:495
#14 0x00005555563d9af6 in std::_Bind<void 
(*(std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<bool>))(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)>::operator()<, void>() 
(this=0x55555702f1d0)
    at 
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/functional:580
#15 0x00005555563d9ac5 in std::__invoke_impl<void, std::_Bind<void 
(*(std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<bool>))(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)>&>(std::__invoke_other, std::_Bind<void 
(*(std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<bool>))(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)>&) (__f=...)
    at 
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/invoke.h:61
#16 0x00005555563d9a85 in std::__invoke_r<void, std::_Bind<void 
(*(std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<bool>))(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)>&>(std::_Bind<void 
(*(std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<bool>))(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)>&) (__fn=...) at 
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/invoke.h:111
#17 0x00005555563d994d in std::_Function_handler<void (), std::_Bind<void 
(*(std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > c
onst>, std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<bool>))(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)> >::_M_invoke(std::_Any_data const&) 
(__functor=...) at 
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/std_function.h:290
#18 0x00005555563b7c55 in std::function<void ()>::operator()() const 
(this=0x7fffffff7558) at 
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/std_function.h:591
#19 0x00005555563d82b9 in 
lyx::frontend::InGuiThread<void>::synchronousFunctionCall (this=0x7fffffff7538) 
at /home/scott/lyxbuilds/master-master/repo/src/frontends/qt/InGuiThread.h:168
#20 0x000055555648a2f2 in lyx::frontend::IntoGuiThreadMover::callInGuiThread 
(this=0x7fffffff7538) at 
/home/scott/lyxbuilds/master-master/repo/src/frontends/qt/InGuiThread.cpp:36
#21 0x00005555563d9756 in 
lyx::frontend::InGuiThread<void>::call<std::_Bind<void 
(*(std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<bool>))(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)> >(std::_Bind<void 
(*(std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<bool>))(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)>) (this=0x7fffffff7538, f=...)
    at 
/home/scott/lyxbuilds/master-master/repo/src/frontends/qt/InGuiThread.h:126
#22 0x00005555563d7d71 in lyx::frontend::InGuiThread<void>::call<void 
(*)(std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, bool), 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const, std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const, bool> 
(this=0x7fffffff7538, 
    f=0x5555563d6b30 
<lyx::frontend::Alert::doError(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)>, p1=L"Security Warning", 
    p2=L"<p>The following LaTeX backend has been configured to allow execution 
of external programs for any document:</p><center><p><tt>pdflatex -shell-escape 
$$i</tt></p></center><p>This is a dangerous config"..., p3=@0x7fffffff757f: 
false) at 
/home/scott/lyxbuilds/master-master/repo/src/frontends/qt/InGuiThread.h:144
#23 0x00005555563d7020 in lyx::frontend::Alert::error (title=L"Security 
Warning", 
    message=L"<p>The following LaTeX backend has been configured to allow 
execution of external programs for any document:</p><center><p><tt>pdflatex 
-shell-escape $$i</tt></p></center><p>This is a dangerous config"..., 
backtrace=false) at 
/home/scott/lyxbuilds/master-master/repo/src/frontends/qt/GuiAlert.cpp:261
#24 0x0000555555e57a92 in lyx::Converters::checkAuth (this=0x7fffffffb278, 
conv=..., 
doc_fname="/home/scott/lyxbuilds/master-master/repo/lib/examples/Welcome.lyx", 
use_shell_escape=false)
    at /home/scott/lyxbuilds/master-master/repo/src/Converter.cpp:324
#25 0x0000555555e5c4e3 in lyx::Converters::convert (this=0x7fffffffb278, 
buffer=0x555556c25530, from_file=..., to_file=..., orig_from=..., 
from_format="pdflatex", to_format="pdf2", 
    errorList=..., conversionflags=0, includeall=false) at 
/home/scott/lyxbuilds/master-master/repo/src/Converter.cpp:587
#26 0x0000555555d8138a in lyx::Buffer::doExport (this=0x555556c25530, 
target="pdf2", put_in_tempdir=false, includeall=false, result_file="")
    at /home/scott/lyxbuilds/master-master/repo/src/Buffer.cpp:4613
#27 0x0000555555d794b0 in lyx::Buffer::doExport (this=0x555556c25530, 
target="pdf2", put_in_tempdir=false, result_file="") at 
/home/scott/lyxbuilds/master-master/repo/src/Buffer.cpp:4449
#28 0x0000555555d793b4 in lyx::Buffer::doExport (this=0x555556c25530, 
target="pdf2", put_in_tempdir=false) at 
/home/scott/lyxbuilds/master-master/repo/src/Buffer.cpp:4431
#29 0x0000555555d7726d in lyx::Buffer::dispatch (this=0x555556c25530, func=..., 
dr=...) at /home/scott/lyxbuilds/master-master/repo/src/Buffer.cpp:2927
#30 0x0000555555d76e2e in lyx::Buffer::dispatch (this=0x555556c25530, 
command="buffer-export pdf2", result=...) at 
/home/scott/lyxbuilds/master-master/repo/src/Buffer.cpp:2891
#31 0x0000555555f730cb in lyx::LyX::execWithoutGui (this=0x7fffffffd830, 
argc=@0x7fffffffd848: 2, argv=0x7fffffffd968) at 
/home/scott/lyxbuilds/master-master/repo/src/LyX.cpp:564
#32 0x0000555555f7d0c5 in lyx::LyXConsoleApp::doExec (this=0x7fffffffd6d0) at 
/home/scott/lyxbuilds/master-master/repo/src/LyX.cpp:236
#33 0x000055555678483a in lyx::support::ConsoleApplicationPrivate::doExec 
(this=0x555556c20dc0) at 
../../../repo/src/support/ConsoleApplicationPrivate.h:61
#34 0x0000555556784411 in 
lyx::support::ConsoleApplicationPrivate::qt_static_metacall (_o=0x555556c20dc0, 
_c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x555556c25ca8)
    at 
/home/scott/lyxbuilds/master-master/CMakeBuild/src/support/moc_ConsoleApplicationPrivate.cpp:92
#35 0x00007ffff6964d58 in QObject::event (this=0x555556c20dc0, 
e=0x555556c25c60) at 
/usr/src/qt6-base-6.4.2+dfsg-6/src/corelib/kernel/qobject.cpp:1378
#36 0x00007ffff6927825 in doNotify (event=0x555556c25c60, 
receiver=0x555556c20dc0) at 
/usr/src/qt6-base-6.4.2+dfsg-6/src/corelib/kernel/qcoreapplication.cpp:1122
#37 QCoreApplication::notify (event=<optimized out>, receiver=<optimized out>, 
this=<optimized out>) at 
/usr/src/qt6-base-6.4.2+dfsg-6/src/corelib/kernel/qcoreapplication.cpp:1105
#38 QCoreApplication::notifyInternal2 (receiver=0x555556c20dc0, 
event=0x555556c25c60) at 
/usr/src/qt6-base-6.4.2+dfsg-6/src/corelib/kernel/qcoreapplication.cpp:1026
#39 0x00007ffff692789d in QCoreApplication::sendEvent (receiver=<optimized 
out>, event=<optimized out>) at 
/usr/src/qt6-base-6.4.2+dfsg-6/src/corelib/kernel/qcoreapplication.cpp:1442
#40 0x00007ffff6927a37 in QCoreApplicationPrivate::sendPostedEvents 
(receiver=0x0, event_type=0, data=0x555556c03710)
    at 
/usr/src/qt6-base-6.4.2+dfsg-6/src/corelib/kernel/qcoreapplication.cpp:1804
#41 0x00007ffff6b17397 in postEventSourceDispatch (s=0x555556c25ab0) at 
/usr/src/qt6-base-6.4.2+dfsg-6/src/corelib/kernel/qeventdispatcher_glib.cpp:243
#42 0x00007ffff671449d in g_main_dispatch (context=0x555556c23c60) at 
../../../glib/gmain.c:3460
#43 g_main_context_dispatch (context=0x555556c23c60) at 
../../../glib/gmain.c:4200
#44 0x00007ffff676f178 in g_main_context_iterate.constprop.0 
(context=0x555556c23c60, block=<optimized out>, dispatch=1, self=<optimized 
out>) at ../../../glib/gmain.c:4276
#45 0x00007ffff67131b0 in g_main_context_iteration (context=0x555556c23c60, 
may_block=1) at ../../../glib/gmain.c:4343
#46 0x00007ffff6b14f20 in QEventDispatcherGlib::processEvents 
(this=0x555556c21600, flags=...) at 
/usr/src/qt6-base-6.4.2+dfsg-6/src/corelib/kernel/qeventdispatcher_glib.cpp:393
#47 0x00007ffff69319aa in QEventLoop::exec (this=0x7fffffffd4d0, flags=...) at 
/usr/src/qt6-base-6.4.2+dfsg-6/src/corelib/global/qflags.h:34
#48 0x00007ffff692a71c in QCoreApplication::exec () at 
/usr/src/qt6-base-6.4.2+dfsg-6/src/corelib/global/qflags.h:74
#49 0x0000555556784813 in lyx::support::ConsoleApplicationPrivate::execute 
(this=0x555556c20dc0) at 
../../../repo/src/support/ConsoleApplicationPrivate.h:56
#50 0x00005555567843a9 in lyx::support::ConsoleApplication::exec 
(this=0x7fffffffd6d0) at 
/home/scott/lyxbuilds/master-master/repo/src/support/ConsoleApplication.cpp:38
#51 0x0000555555f6d23f in lyx::LyX::exec (this=0x7fffffffd830, 
argc=@0x7fffffffd848: 2, argv=0x7fffffffd968) at 
/home/scott/lyxbuilds/master-master/repo/src/LyX.cpp:354
#52 0x00005555560f9773 in main (argc=2, argv=0x7fffffffd968) at 
/home/scott/lyxbuilds/master-master/repo/src/main.cpp:55

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