/label command fails to wrap label in quotes if label contains an emoji+space at the beginning

Summary

Applying a label to an issue using the /label command fails to wrap quotes around the label when it includes emoji and space at the beginning

Steps to reproduce

Create a label with an emoji and space at the beginning like so

Type the /label command in a new/existing issue so that the available labels show

Select one of the labels that include an emoji + space at the beginning

Expected behavior

Expect the command to autocomplete like so

/label ~"🚧 wip"

Actual behavior

Command autocompletes like this instead

/label ~🚧 wip

Results of GitLab environment info

System information
System:         Ubuntu 16.04
Current User:   git
Using RVM:      no
Ruby Version:   2.3.1p112
Gem Version:    2.6.6
Bundler Version:1.13.6
Rake Version:   10.5.0
Sidekiq Version:4.2.1

GitLab information
Version:        8.13.6
Revision:       69cda01
Directory:      /opt/gitlab/embedded/service/gitlab-rails
DB Adapter:     postgresql
URL:            https://xxx
HTTP Clone URL: https://xxx
SSH Clone URL:  git@xxx
Using LDAP:     no
Using Omniauth: no

GitLab Shell
Version:        3.6.6
Repository storage paths:
- default:      /var/opt/gitlab/git-data/repositories
Hooks:          /opt/gitlab/embedded/service/gitlab-shell/hooks/
Git:            /opt/gitlab/embedded/bin/git