I have no idea what I was thinking when I resolved this. My apologies.

My comment just means there's a simple workaround, not that this isn't a bug.

However, it's not as bad due to presence of workaround.

Hello,
I have the same problem with Jenkins 2.1.
On Chrome and Firefox (not tested elsewhere), in job config page, the command in the "execute shell" textarea is always displayed on a single row (without any word wrap) and the page gets wider and wider if you have very long commands. This does not happen in the "job description" textarea, so I think is due to CodeMirror (css or code).
Moreover, the suggested workaround (trying to disable CodeMirror) does not work: the checkbox "disable syntax highlighting" do nothing. I checked it and also restarted Jenkins, and nothing changed.

Thanks, Donato

Adding "max-width: 550px" to the .CodeMirror-scroll class inside codemirror.css will enable the desired and expected behavior. 550px is just an approximate - if someone has a better value, feel free to share it.

EDIT: changed 750px to 550px after some experimentation.

kwaping Could you create a PR for that so we can review and, if acceptable, integrate in Jenkins?

danielbeck I accept your challenge.

kwaping You didn't create that PR yet, did you?

No, a combination of work commitments and my solution not being very good have been standing in my way.

kwaping I asked someone else to take care of this, PR is at https://github.com/jenkinsci/jenkins/pull/2575 – if you have the time, test it to make sure it works as expected. There's a PR build you can download and try.

As noted in the PR, this is a very good solution that works well in my testing.