FIX: tree state in treeview should be preserved when saving (ISXB-966)

[smnwttbr]

Description

When the input action asset is saved, the selection state of the trees in the editor will occasionally be reset.

Changes made

The TreeStateView has now been setup correctly.

Testing

Manual testing only.

Risk

Risk is 0.

Checklist

Before review:

• [ ] Changelog entry added.
  • Explains the change in Changed, Fixed, Added sections.
  • For API change contains an example snippet and/or migration example.
  • JIRA ticket linked, example (case %%). If it is a private issue, just add the case ID without a link.
  • Jira port for the next release set as "Resolved".
• [ ] Tests added/changed, if applicable.
  • Functional tests Area_CanDoX, Area_CanDoX_EvenIfYIsTheCase, Area_WhenIDoX_AndYHappens_ThisIsTheResult.
  • Performance tests.
  • Integration tests.
• [ ] Docs for new/changed API's.
  • Xmldoc cross references are set correctly.
  • Added explanation how the API works.
  • Usage code examples added.
  • The manual is updated, if needed.

During merge:

• [ ] Commit message for squash-merge is prefixed with one of the list:
  • NEW: ___.
  • FIX: ___.
  • DOCS: ___.
  • CHANGE: ___.
  • RELEASE: 1.1.0-preview.3.

After merge:

• [ ] Create forward/backward port if needed. If you are blocked from creating a forward port now please add a task to ISX-1444.

[Pauliusd01]

@smnwttbr will take a look at this today. At first sight though there seems to be a lot of CI failures, have you looked into those yet? Fine for me to test or are you planning some revisions?

[smnwttbr]

InstanceID was being used for the viewDataKey, which changes on domain reloads.

[Pauliusd01]

https://github.com/user-attachments/assets/4af90b49-786b-48db-986d-4aae0bc3b5cf On heavier, domain reload prone projects (like the one in the alternative steps) the selection is still reset but the expansions are maintained so it is still a noticeable improvement. Just making sure this is expected? I'm fine with approving as I did not notice any issues