Ctrl-Z doesn't work in issue description textarea
Summary
In the "create issue" issue description textarea, Ctrl-Z does not perform the usual "undo" function. This is particularly annoying after accidentally pasting something - normally, Ctrl-Z would immediately undo the mistake, but now I have to manually select the mis-pasted text and delete it.
Steps to reproduce
- In Gitlab, navigate to "New Issue"
- Paste something in the "Description" editor
- Press Ctrl+Z
Example Project
Any project will do.
What is the current bug behavior?
Nothing happens.
What is the expected correct behavior?
The last editing action (pasting, in this case) is undone.
Further Information
Firefox 60.5.0esr (64-bit), running on Debian GNU/Linux 9.