Add fixed value as static input

[Klochette]

Fixes

Fixes #611 by @MiskoG

Description

When the selected attribute in the tree is primitive and has a fixed value, add a disabled static input.

Definition of Done

• [ ] I followed the Arkhn Code Book (I swear!).
• [ ] I have written tests for the code I added or updated.
• [ ] I have updated the documentation according to my changes.
• [ ] I have updated the deployment configuration if needed.

[Klochette]

@MiskoG @nriss do I need to disable or remove the little bin next to the static input when it's a fixed value ?

[MiskoG]

@MiskoG @nriss do I need to disable or remove the little bin next to the static input when it's a fixed value ?

Yep better to get rid of the bin 🙂