This is an acknowledged problem with wxFileDialog. Not sure what to do about it. It works OK with .ttf outside c:\Windows\Fonts but not inside that magic folder.

We could have a "use system font" which offered a manually-assembled list from c:\windows\fonts or /usr/share/fonts or whever, then a file dialog for fonts in other places. This might be the best we can do.

fe6921ea758a84d3982180cb2a8e6d95be9cf732

At some point this has re-surfaced; SystemFontDialog is still there, but nobody is calling it.

Looks like f77ec143719c86ddbf098bff6d19fe2a159b8c3e broke it in v2.13.110

Branch looks OK but selecting bahnschrift.ttf reliably crashes DoM.

Same font seems OK on Linux.

#0  0x00007ff9dcd6a313 in ntdll!RtlRegisterSecureMemoryCacheCallback () from C:\WINDOWS\SYSTEM32\ntdll.dll
0000001  0x00007ff9dcd2cd24 in ntdll!memset () from C:\WINDOWS\SYSTEM32\ntdll.dll
0000002  0x00007ff9dcd691c1 in ntdll!RtlRegisterSecureMemoryCacheCallback () from C:\WINDOWS\SYSTEM32\ntdll.dll
0000003  0x00007ff9dcc95cc1 in ntdll!RtlGetCurrentServiceSessionId () from C:\WINDOWS\SYSTEM32\ntdll.dll
0000004  0x00007ff9dcc95b74 in ntdll!RtlGetCurrentServiceSessionId () from C:\WINDOWS\SYSTEM32\ntdll.dll
0000005  0x00007ff9dcc947b1 in ntdll!RtlFreeHeap () from C:\WINDOWS\SYSTEM32\ntdll.dll
0000006  0x00007ff9db719c9c in msvcrt!free () from C:\WINDOWS\System32\msvcrt.dll
0000007  0x00007ff99d939bfb in cairo_ft_apply_variations () from C:\Program Files\DCP-o-matic 2 debug\bin\libcairo-2.dll
0000008  0x00007ff99d93bd66 in cairo_ft_scaled_font_lock_face () from C:\Program Files\DCP-o-matic 2 debug\bin\libcairo-2.dll
0000009  0x00007ff99acc6740 in _pango_fc_shape (font=<optimized out>, item_text=0x2dbe5e2bb60 "This is a subtitle, and it göeß", item_length=33, analysis=0x2dbe3407890, glyphs=0x2dbe3405680, paragraph_text=0x2dbe5e2bb60 "This is a subtitle, and it göeß", paragraph_length=33) at pangofc-shape.c:296
0000010 0x00007ff9a4b5fc62 in pango_shape_full (item_text=0x2dbe5e2bb60 "This is a subtitle, and it göeß", item_length=33, paragraph_text=<optimized out>, paragraph_length=33, analysis=0x2dbe3407890, glyphs=0x2dbe3405680) at shape.c:116
0000011 0x00007ff9a4b51cd8 in shape_run (line=line@entry=0x2dbe3408480, state=state@entry=0xed647fe8f0, item=item@entry=0x2dbe3407880) at pango-layout.c:3296
0000012 0x00007ff9a4b528d5 in process_item (layout=layout@entry=0x2dbe3406420, line=line@entry=0x2dbe3408480, state=state@entry=0xed647fe8f0, force_fit=force_fit@entry=1, no_break_at_end=no_break_at_end@entry=0) at pango-layout.c:3409
0000013 0x00007ff9a4b54d9a in process_line (state=0xed647fe8f0, layout=0x2dbe3406420) at pango-layout.c:3708
0000014 pango_layout_check_lines (layout=0x2dbe3406420) at pango-layout.c:4036
0000015 0x00007ff9a4b56a6f in pango_layout_get_extents_internal (layout=0x2dbe3406420, ink_rect=0x0, logical_rect=0xed647feb10, line_extents=0x0) at pango-layout.c:2590
0000016 0x00007ff9a4b56ffb in pango_layout_get_extents (logical_rect=0xed647feb10, ink_rect=0x0, layout=0x2dbe3406420) at pango-layout.c:2785
0000017 pango_layout_get_pixel_extents (layout=0x2dbe3406420, ink_rect=0x0, logical_rect=0xed647feb10) at pango-layout.c:2811
0000018 0x00007ff9a4b57068 in pango_layout_get_pixel_size (layout=<optimized out>, width=0xed647febf0, height=0xed647febf4) at pango-layout.c:2860
0000019 0x00007ff9bd2c9ea5 in Pango::Layout::get_pixel_size(int&, int&) const () from C:\Program Files\DCP-o-matic 2 debug\bin\libpangomm-1.4-1.dll
0000020 0x00007ff724bd95cc in render_line (subtitles=..., target=..., time=..., frame_rate=24) at ../src/lib/render_text.cc:294
0000021 0x00007ff724bda09f in render_text (subtitles=..., target=..., time=..., frame_rate=24) at ../src/lib/render_text.cc:383
0000022 0x00007ff724bb2dac in Player::open_subtitles_for_frame (this=0x2dbe5fbf480, time=...) at ../src/lib/player.cc:882
0000023 0x00007ff724bb76a9 in Player::do_emit_video (this=0x2dbe5fbf480, pv=..., time=...) at ../src/lib/player.cc:1340
0000024 0x00007ff724bb7591 in Player::emit_video (this=0x2dbe5fbf480, pv=..., time=...) at ../src/lib/player.cc:1327
0000025 0x00007ff724bb1667 in Player::pass (this=0x2dbe5fbf480) at ../src/lib/player.cc:727
0000026 0x00007ff724a3852e in Butler::thread (this=0x2dbe5fc1990) at ../src/lib/butler.cc:213
0000027 0x00007ff724fb6345 in boost::_mfi::mf0<void, Butler>::operator() (this=0x2dbe33a83a8, p=0x2dbe5fc1990) at /opt/mxe/usr/x86_64-w64-mingw32.shared/include/boost/bind/mem_fn_template.hpp:49
0000028 0x00007ff724e22849 in boost::_bi::list1<boost::_bi::value<Butler*> >::operator()<boost::_mfi::mf0<void, Butler>, boost::_bi::list0> (this=0x2dbe33a83b8, f=..., a=...) at /opt/mxe/usr/x86_64-w64-mingw32.shared/include/boost/bind/bind.hpp:238
0000029 0x00007ff724e37d63 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, Butler>, boost::_bi::list1<boost::_bi::value<Butler*> > >::operator() (this=0x2dbe33a83a8) at /opt/mxe/usr/x86_64-w64-mingw32.shared/include/boost/bind/bind.hpp:1273
0000030 0x00007ff724e82a1e in boost::detail::thread_data<boost::_bi::bind_t<void, boost::_mfi::mf0<void, Butler>, boost::_bi::list1<boost::_bi::value<Butler*> > > >::run (this=0x2dbe33a8310) at /opt/mxe/usr/x86_64-w64-mingw32.shared/include/boost/thread/detail/thread.hpp:120
0000031 0x00007ff9a7b82235 in boost::(anonymous namespace)::thread_start_function(void*) () from C:\Program Files\DCP-o-matic 2 debug\bin\libboost_thread-mt-x64.dll
0000032 0x00007ff9db73af5a in msvcrt!_beginthreadex () from C:\WINDOWS\System32\msvcrt.dll
0000033 0x00007ff9db73b02c in msvcrt!_endthreadex () from C:\WINDOWS\System32\msvcrt.dll
0000034 0x00007ff9db547034 in KERNEL32!BaseThreadInitThunk () from C:\WINDOWS\System32\kernel32.dll
0000035 0x00007ff9dccc2651 in ntdll!RtlUserThreadStart () from C:\WINDOWS\SYSTEM32\ntdll.dll
0000036 0x0000000000000000 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)```

Crash fixed by bumping cairo to 1.17.4.