Pasting code block copied from Comment Cannot be Undone

Summary

Pasting code block copied from Comment Cannot be Undone

Steps to reproduce

  • Create a new issue in a test project
  • Add the following ruby code block as a comment
x = 1 + 1
y = x + 1
  • Select the above Ruby code block in your latest comment and copy and paste into a new comment
  • The response should be pasted with ruby code block in tact
  • Attempt to undo your action with Cmd + z

What is the current bug behavior?

The paste of the code block isn't undone, as expected

What is the expected correct behavior?

The paste of the code block should be undone

Relevant logs and/or screenshots

N/A

Output of checks

reproduced on GitLab.com

Results of GitLab environment info

reproduced on GitLab.com