Can anyone help with a workaround suggestion while we're waiting for
this to get fixed?

I normally manually patch package issues like this, but for some reason
it doesn't seem to be working in this case:

```
TMPDIR=$(mktemp -d)
cd $TMPDIR
apt-get -y source snapd
sed -i 's/"http", "https", "mailto", "snap", "help"/"http", "https", "mailto", 
"snap", "help", "apt", "zoommtg", "slack"/' 
snapd-2.42.1+19.10/usersession/userd/launcher.go
cd snapd-2.42.1+19.10 && dch -l$(hostname) fix_missing_app_types
cd ..
cd snapd-2.42.1+19.10$(hostname)1 && DEB_BUILD_OPTIONS=nocheck debuild -b -uc 
-us
cd ..
sudo dpkg -i snapd_2.42.1+19.10$(hostname)1_amd64.deb
```

It seems to be updating /usr/bin/snap properly, but the xdg-open is
still blocked.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to chromium-browser in Ubuntu.
https://bugs.launchpad.net/bugs/1776873

Title:
  Whitelisted allowedURLschemes breaks some desktop apps

Status in snapd:
  Triaged
Status in chromium-browser package in Ubuntu:
  Confirmed

Bug description:
  
https://github.com/snapcore/snapd/blob/7952972d4897e085030b288e44dc98b824f6723a/userd/launcher.go#L55

  snapd has a hard-coded list of allowed URL schemes. Currently that is
  limited to "http", "https", "mailto", "snap".

  We have a number of applications in the store which are trying to use
  protocol handlers outside this scope and break when that's not
  possible.

  e.g.

  Telegram Desktop: tg:/
  Github Desktop: git:/
  IRCCloud Desktop: irc:/

  These are the ones I know of, others may also be affected. Can we
  please at least expand the list to those that we know of, and perhaps
  research other popular protocol handlers?

  Ideally we wouldn't have a whitelist, because this delays our ability
  to land new applications with as-yet unknown url schemes.

To manage notifications about this bug go to:
https://bugs.launchpad.net/snapd/+bug/1776873/+subscriptions

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