@eddgrant Sorry, I rushed my previous comment a bit. I'll elaborate
below.

To start with the good news: upgrading libmutter to the proposed version
has fixed the IntelliJ crash problem. I haven't had any trouble since.

I was referring to the article
https://wiki.ubuntu.com/Testing/EnableProposed, referenced by @sil2100
in #10. It first instructs you how to enable proposed updates, and then,
in the paragraph "Selective upgrading from proposed", to pin packages to
their current versions (i.e. stable, not proposed), by creating
`/etc/apt/preferences.d/proposed-updates` with this content:

```
Package: *
Pin: release a=eoan-proposed
Pin-Priority: 400
```

The article reads `xenial`, not `eoan`, but I'm assuming you made that
substitution, because we're dealing with Ubuntu 19.10 here, not 18.04.

If you did all this, then that would prevent `apt upgrade` from
upgrading ALL packages from `eoan-proposed`. That's good, because we're
only interested in testing the fix for `mutter`, not the hundreds of
other proposed packages. However, if you then continue to follow
instructions from that same page, you would end up doing something like:

`sudo apt-get install mutter/eoan-proposed`

This won't work as intended, because the new version of mutter depends
on new versions of some other stuff (like libmutter, probably), also in
eoan-proposed, but apt won't see it because it has been pinned by the
pin file you created. The proper way of going about this, then, is to:

- comment the contents of the `/etc/apt/preferences.d/proposed-updates` with #'s
- run `sudo apt-get install libmutter-5-0/eoan-proposed mutter/eoan-proposed`
- uncomment again, to make sure you won't cut yourself on the bleeding edge of 
some other update

Good luck!

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1845281

Title:
  gnome-shell crashed with SIGABRT in __GI_raise() from __GI_abort()
  from g_assertion_message() from g_assertion_message_expr() from
  meta_window_get_workspaces() [assertion failure "code should not be
  reached"]

Status in Mutter:
  Fix Released
Status in gnome-shell package in Ubuntu:
  Won't Fix
Status in mutter package in Ubuntu:
  Fix Released
Status in mutter source package in Eoan:
  Fix Committed

Bug description:
  [ Description ]

  Intellij and other java apps can cause GNOME shell to crash

  [ Test case ]

  1) Run this test case:
     https://gitlab.gnome.org/3v1n0/mutter/snippets/956
  2) Windows should appear and close correctly while
     Gnome shell must not crash

  [ Regression potential ]

  Parent-child relationship on some windows might be broken.

  ---

  The Ubuntu Error Tracker has been receiving reports about a problem regarding 
gnome-shell.  This problem was most recently seen with package version 
3.34.0-1ubuntu1, the problem page at 
https://errors.ubuntu.com/problem/85b6b0b07aafeed5ae109ce89a813b77d3721684 
contains more details, including versions of packages affected, stacktrace or 
traceback, and individual crash reports.
  If you do not have access to the Ubuntu Error Tracker and are a software 
developer, you can request it at http://forms.canonical.com/reports/.

To manage notifications about this bug go to:
https://bugs.launchpad.net/mutter/+bug/1845281/+subscriptions

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