OK. Some freezes today, though they would resolve if I waited long enough. Here's the gdb backtrace. Hope it is useful!

#0 _strncpy_sse2_unaligned () at ../sysdeps/x86_64/multiarch/strcpy-sse2-unaligned.S:1126
#1 0x00007ffff6bb85d9 in g_strndup () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007ffff7ac2f18 in pango_layout_set_text () at /lib/x86_64-linux-gnu/libpango-1.0.so.0
#3 0x00007ffff7d794df in (anonymous namespace)::LayoutSetText (text=Python Exception <class 'gdb.error'>: value has been optimized out
, layout=0x5555581fe3b0)
at /usr/include/c++/13/string_view:289
#4 (anonymous namespace)::ClusterIterator::ClusterIterator (text=Python Exception <class 'gdb.error'>: value has been optimized out
, layout=0x5555581fe3b0, this=0x7fffffffad50)
at ../scintilla/gtk/PlatGTK.cxx:837
#5 Scintilla::SurfaceImpl::MeasureWidthsUTF8 (this=, font=0x55555871ef40, text=Python Exception <class 'gdb.error'>: value has been optimized out
, positions=0x7fffdfe0cac0)
at ../scintilla/gtk/PlatGTK.cxx:1079
#6 0x00007ffff7df7106 in PositionCache::MeasureWidths
(this=0x5555577d29a0, surface=, vstyle=, styleNumber=4, unicode=true, sv="728333", positions=0x7fffdfe0cac0, needsLocking=false) at ../scintilla/src/PositionCache.cxx:1169
#7 0x00007ffff7de0284 in (anonymous namespace)::LayoutSegments
(pCache=, surface=0x5555587475f0, vstyle=..., ll=0x5555586d9960, segments=std::vector of length 1499999, capacity 2097152 = {...}, nextIndex=, textUnicode=true, multiThreaded=false) at ../scintilla/src/EditView.cxx:376
#8 0x00007ffff7de8c23 in operator() (__closure=) at ../scintilla/src/EditView.cxx:513
#9 std::__invoke_impl<void, Scintilla::Internal::EditView::LayoutLine(const Scintilla::Internal::EditModel&, Scintilla::Internal::Surface*, const Scintilla::Internal::ViewStyle&, Scintilla::Internal::LineLayout*, int, bool)::<lambda()> >
(__f=) at /usr/include/c++/13/bits/invoke.h:61
#10 std::__invoke<Scintilla::Internal::EditView::LayoutLine(const Scintilla::Internal::EditModel&, Scintilla::Internal::Surface*, const Scintilla::Internal::ViewStyle&, Scintilla::Internal::LineLayout*, int, bool)::<lambda()> > (__fn=)
at /usr/include/c++/13/bits/invoke.h:96
#11 std::thread::_Invoker<std::tuple<Scintilla::Internal::EditView::LayoutLine(const Scintilla::Internal::EditModel&, Scintilla::Internal::Surface*, const Scintilla::Internal::ViewStyle&, Scintilla::Internal::LineLayout*, int, bool)::<lambda()> > >::_M_invok--Type for more, q to quit, c to continue without paging--
e<0> (this=) at /usr/include/c++/13/bits/std_thread.h:292
#12 std::thread::_Invoker<std::tuple<Scintilla::Internal::EditView::LayoutLine(const Scintilla::Internal::EditModel&, Scintilla::Internal::Surface*, const Scintilla::Internal::ViewStyle&, Scintilla::Internal::LineLayout*, int, bool)::<lambda()> > >::operator() (this=) at /usr/include/c++/13/bits/std_thread.h:299
#13 std::__future_base::_Task_setter<std::unique_ptr<std::__future_base::_Result, std::__future_base::_Result_base::_Deleter>, std::thread::_Invoker<std::tuple<Scintilla::Internal::EditView::LayoutLine(const Scintilla::Internal::EditModel&, Scintilla::Internal::Surface*, const Scintilla::Internal::ViewStyle&, Scintilla::Internal::LineLayout*, int, bool)::<lambda()> > >, void>::operator() (this=) at /usr/include/c++/13/future:1432
#14 std::__invoke_impl<std::unique_ptr<std::__future_base::_Result, std::__future_base::_Result_base::_Deleter>, std::__future_base::_Task_setter<std::unique_ptr<std::__future_base::_Result, std::__future_base::_Result_base::_Deleter>, std::thread::_Invoker<std::tuple<Scintilla::Internal::EditView::LayoutLine(const Scintilla::Internal::EditModel&, Scintilla::Internal::Surface*, const Scintilla::Internal::ViewStyle&, Scintilla::Internal::LineLayout*, int, bool)::<lambda()> > >, void>&>
(__f=) at /usr/include/c++/13/bits/invoke.h:61
#15 std::__invoke_r<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter>, std::__future_base::_Task_setter<std::unique_ptr<std::__future_base::_Result, std::__future_base::_Result_base::_Deleter>, std::thread::_Invoker<std::tuple<Scintilla::Internal::EditView::LayoutLine(const Scintilla::Internal::EditModel&, Scintilla::Internal::Surface*, const Scintilla::Internal::ViewStyle&, Scintilla::Internal::LineLayout*, int, bool)::<lambda()> > >, void>&>
(__fn=) at /usr/include/c++/13/bits/invoke.h:116
#16 std::_Function_handler<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter>(), std::__future_base::_Task_setter<std::unique_ptr<std::__future_base::_Result, std::__future_base::_Result_base::_Deleter>, std::thread::_Invoker<std::tuple<Scintilla::Internal::EditView::LayoutLine(const Scintilla::Internal::EditModel&, Scintilla::Internal::Surface*, const Scintilla::Internal::ViewStyle&, Scintilla::Internal::LineLayout*, int, bool)::<lambda()> > >, void> >::_M_invoke(const std::_Any_data &) (__functor=<error reading variable: Cannot access memory at address 0x7fffffffb568>)
at /usr/include/c++/13/bits/std_function.h:291
--Type for more, q to quit, c to continue without paging--c
#17 0x00007ffff7dbc592 in std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>::operator()() const (this=) at /usr/include/c++/13/bits/std_function.h:591
#18 std::__future_base::_State_baseV2::_M_do_set(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>, bool) (this=0x5555587cdf50, __f=, __did_set=0x7fffffffb6a7)
at /usr/include/c++/13/future:589
#19 0x00007ffff78a1ec3 in __pthread_once_slow (once_control=0x5555587cdf68, init_routine=0x7ffff68e93b0 <__once_proxy>)
at ./nptl/pthread_once.c:116
#20 0x00007ffff7de8b0d in __gthread_once
(__func=, __once=<error reading variable: Cannot access memory at address 0x7fffffffb678>)
at /usr/include/x86_64-linux-gnu/c++/13/bits/gthr-default.h:700
#21 std::call_once<void (std::__future_base::_State_baseV2::)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>, bool*), std::__future_base::_State_baseV2*, std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>, bool>(std::once_flag&, void (std::__future_base::_State_baseV2::&&)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>, bool*), std::__future_base::_State_baseV2*&&, std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>&&, bool&&)
(__f=<error reading variable: Cannot access memory at address 0x7fffffffb6c0>, __once=<error reading variable: Cannot access memory at address 0x7fffffffb678>) at /usr/include/c++/13/mutex:907
#22 std::__future_base::_State_baseV2::_M_set_result(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>, bool) (__ignore_failure=true, __res=Python Exception <class 'gdb.MemoryError'>: Cannot access memory at address 0x7fffffffb6f0

#23 std::__future_base::_Deferred_state<std::thread::_Invoker<std::tuple<Scintilla::Internal::EditView::LayoutLine(const Scintilla::Internal::EditModel&, Scintilla::Internal::Surface*, const Scintilla::Internal::ViewStyle&, Scintilla::Internal::LineLayout*, int, bool)::<lambda()> > >, void>::_M_complete_async(void)
(this=<error reading variable: Cannot access memory at address 0x7fffffffb678>) at /usr/include/c++/13/future:1705
#24 0x00007ffff7de6487 in std::__future_base::_State_baseV2::wait (this=0x5555587cdf50) at /usr/include/c++/13/future:347
#25 std::__basic_future::wait (this=0x555555bf95d0) at /usr/include/c++/13/future:716
#26 Scintilla::Internal::EditView::LayoutLine
(this=, model=, surface=, vstyle=, ll=, width=, callerMultiThreaded=) at ../scintilla/src/EditView.cxx:518

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