Cmd/Ctrl + Return in the content editor submits the form but does not save changes

Summary

Using Cmd/Ctrl + Return to submit the content editor changes does not actually save any of the content.

Steps to reproduce

1. Edit a Wiki page in the Content Editor
2. Make some changes
3. Submit the changes using Cmd/Ctrl + Return
4. Observe that none of the changes are reflected on the page

Example Project

What is the current bug behavior?

What is the expected correct behavior?

Relevant logs and/or screenshots

Output of checks

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)

(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes