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Gitlab wiki hides front matter when editing page and removes it on update

Summary

Wiki editor removes Front Matter from wiki pages.

Steps to reproduce

  1. open edit form for any wiki page
  2. add Front Matter
  3. save - it is saved correctly
  4. open edit of that same page again
  5. observe that the Front Matter is not visible (although it is in the file in the wiki git repo)
  6. save - front matter is stripped from the file and destroyed

What is the expected correct behavior?

I understand that you want to remove it for rendering the wiki, but please show it in the editor, so it can be preserved when edits are made.

Results of GitLab environment info

Expand for output related to GitLab environment info 

System information
System:		Ubuntu 20.04
Current User:	git
Using RVM:	no
Ruby Version:	2.7.5p203
Gem Version:	3.1.4
Bundler Version:2.2.33
Rake Version:	13.0.6
Redis Version:	6.2.6
Sidekiq Version:6.4.0
Go Version:	unknown

GitLab information
Version:	14.9.3
Revision:	ec11aba56f1
Directory:	/opt/gitlab/embedded/service/gitlab-rails
DB Adapter:	PostgreSQL
DB Version:	12.8
URL:		
HTTP Clone URL:	
SSH Clone URL:	
Using LDAP:	no
Using Omniauth:	yes
Omniauth Providers: 

GitLab Shell
Version:	13.24.0
Repository storage paths:
- default: 	/var/opt/gitlab/git-data/repositories
GitLab Shell path:		/opt/gitlab/embedded/service/gitlab-shell

Results of GitLab application Check

Expand for output related to the GitLab application check 
Checking GitLab subtasks ...


Checking GitLab Shell ...


GitLab Shell: ... GitLab Shell version >= 13.24.0 ? ... OK (13.24.0)
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Internal API available: OK
Redis available via internal API: OK
gitlab-shell self-check successful


Checking GitLab Shell ... Finished


Checking Gitaly ...


Gitaly: ... default ... OK


Checking Gitaly ... Finished


Checking Sidekiq ...


Sidekiq: ... Running? ... yes
Number of Sidekiq processes (cluster/worker) ... 1/1


Checking Sidekiq ... Finished


Checking Incoming Email ...


Incoming Email: ... Reply by email is disabled in config/gitlab.yml


Checking Incoming Email ... Finished


Checking LDAP ...


LDAP: ... LDAP is disabled in config/gitlab.yml


Checking LDAP ... Finished


Checking GitLab App ...


Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... yes
Systemd unit files or init script exist? ... skipped (omnibus-gitlab has neither init script nor systemd units)
Systemd unit files or init script up-to-date? ... skipped (omnibus-gitlab has neither init script nor systemd units)
Projects have namespace: ...
23/2 ... yes
34/170 ... yes
Redis version >= 5.0.0? ... yes
Ruby version >= 2.7.2 ? ... yes (2.7.5)
Git user has default SSH configuration? ... yes
Active users: ... 33
Is authorized keys file accessible? ... yes
GitLab configured to store new projects in hashed storage? ... yes
All projects are in hashed storage? ... yes


Checking GitLab App ... Finished


Checking GitLab subtasks ... Finished