Indentation in XML/JSON view broken

[philippfromme]

Describe the bug

The indentation in the XML and JSON view isn't working anymore. It's not displayed and I cannot indent a line using SPACE or TAB.

Steps to reproduce

1. Open XML or JSON view
2. Indentation not working
3. Cannot indent

Expected behavior

Indentation works.

Environment

• Camunda Modeler Version: 5.28-rc.1

Additional context

No response

[barmac]

I've run git bisect, and the first commit to break it is the form-js update: 8f6662d

[barmac]

The update installs new versions of multiple codemirror packages. I will update in the client and see if it fixes the problem.

[barmac]

I've got a fix for this, and will create a PR in a second.

[nikku]

Closed via #4560.