fix(header) ensure instance name is unique and ot matched against previous name

[edlerd]

Done

• ensure instance name is unique and not matched against previous name on renaming

QA

1. Run the LXD-UI:
   • On the demo server via the link posted by @webteam-app below. This is only available for PRs created by collaborators of the repo. Ask @mas-who or @edlerd for access.
   • With a local copy of this branch, build and run as described in the docs.
2. Perform the following QA steps:
   • rename an instance
   • change name to the same name as the current name. Previously it would cause a validation error, now it should be fine.

[webteam-app]

Demo

Jenkins

demos.haus

[mas-who]

code looks good and can confirm no validation error occurs once name is changed :slightly_smiling_face:

I found a pre-existing behaviour that's a bit strange:

1. click on the rename header
2. change the instance name but don't save
3. click cancel
4. click on the rename header again and it shows the changed name in step 2.

Is this intended behaviour?

[edlerd]

1. click on the rename header
2. change the instance name but don't save
3. click cancel
4. click on the rename header again and it shows the changed name in step 2.

Is this intended behaviour?

This is not ideal. Added a change to reset the value in the form on cancel.

[mas-who]

LGTM, thanks for the fix :+1: