Validations can be added to a read-only field

[korthout]

Describe the Bug

I can configure validations on a read-only field.

In Camunda 8, this can lead to a task that cannot be completed in Tasklist because the field doesn't have a value (no variable was provided for the field key). As a workaround, a local variable can be created.

Steps to Reproduce

1. Open Camunda Modeler
2. Create a new Form
3. Add a TextField
4. Make it read-only
5. Define validations, e.g. make the field required

Expected Behavior

It doesn't make sense to add validations to a read-only field. It can not be altered anymore.

Environment

• Host (Browser/Node version), if applicable: [e.g. MS Edge 18, Chrome 69, Node 10 LTS]
• OS: [e.g. Windows 7]
• Library version: [e.g. 2.0.0]