Aegisub crashes immediately after opening the context menu

[scx]

I hit a similar problem in another distribution. I believe that this is related to the spell checking code (list available languages).
The same error occurs in Debian 10.0.0 (debian-live-10.0.0-amd64-mate.iso).
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=935724
It should be mention that this bug doesn't affect Aegisub in Ubuntu 16.04 LTS.

Steps to reproduce:
1. Run aegisub-3.2
2. Disable update checker if needed (first run only)
3. Press the context menu key

I suspect these components as the cause of the error:
a. libstdc++:
It may be a problem with Dual ABI.
However, it should also affect package in Ubuntu 16.04 LTS, but it doesn't.
https://wiki.debian.org/GCC5
https://gcc.gnu.org/onlinedocs/gcc-5.2.0/libstdc++/manual/manual/using_dual_abi.html

b. GCC:
Maybe this is caused by aggressive GCC 8 optimizations.
Maybe this is about some hardening flags (-D_GLIBCXX_ASSERTIONS)?

c. Boost:
Aegisub may be not 100% compatible with the latest Boost. TUV doesn't even support Boost 1.69 OOTB. I believe that they are still using Boost 1.58.

gdb output:
> Thread 1 "aegisub-3.2" received signal SIGSEGV, Segmentation fault.
> 0x00005555559b6cab in SubsTextEditCtrl::OnContextMenu (this=0x555556395b80,
> event=...) at /usr/include/c++/8/bits/unique_ptr.h:342
> warning: Source file is more recent than executable.
> 342 get() const noexcept

I don't use Debian/Ubuntu on a daily basis. I used LiveDVD (ubuntu-mate-19.04-desktop-amd64.iso).

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: aegisub 3.2.2+dfsg-4
ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6
Uname: Linux 5.0.0-13-generic x86_64
ApportVersion: 2.20.10-0ubuntu27.1
Architecture: amd64
CasperVersion: 1.405
CurrentDesktop: MATE
Date: Sun Aug 25 18:25:18 2019
ExecutablePath: /usr/bin/aegisub-3.2
LiveMediaBuild: Ubuntu-MATE 19.04 "Disco Dingo" - Release amd64 (20190416)
ProcEnviron:
 SHELL=/bin/bash
 LANG=C.UTF-8
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
 PATH=(custom, no user)
SourcePackage: aegisub
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.apport.crashdb.conf: 2019-08-25T17:56:30.734947

[scx (the-scx)]

A similar error occurs in Debian 9 oldstable (debian-live-9.9.0-amd64-mate.iso) and openSUSE Tumbleweed (openSUSE-Tumbleweed-GNOME-Live-x86_64-Snapshot20190823-Media.iso).
In the second case, you have to manually install the 'myspell*' packages.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=935724#10

[scx (the-scx)]

See also:
https://github.com/Aegisub/Aegisub/issues/131
https://github.com/Aegisub/Aegisub/pull/132

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "Fix crashing when picking language" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

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