Diagram becomes dirty even though we have not done changes

[sathya-1994]

I am using GLSP's vscode extension.

Steps to reproduce:

1. Open diagram form .wf file
2. Try to edit node label using double
3. Don't update label click on other node

Expected: Diagram editor should not be come dirty
Actual: Diagram editor will be dirty even though we have not changed content

[planger]

I believe this is a bug. I'll convert this into a Github issue.

[planger]

#766