FIX: ISXB-1343 show dialog for unsaved changes

[smnwttbr]

Description

A check for an existing and dirty asset was added to the OpenWindow(asset) method. If a dirty asset is loaded, a dialog is presented allowing the user to save changes, cancel the operation or discard changes and continue.

Testing status & QA

Package tests.

Overall Product Risks

Please rate the potential complexity and halo effect from low to high for the reviewers. Note down potential risks to specific Editor branches if any.

• Complexity: 0
• Halo Effect: 0

Comments to reviewers

Please describe any additional information such as what to focus on, or historical info for the reviewers.

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]

There were some CI failures so might want to check those out, otherwise lgtm. Checked opening a different action window with both manual save/auto save options after changing schemes,maps,actions,bindings, etc.

[Secticide]

I noticed my previous change #2149 added a changelog entry to the previous release, fixed up as part of 2677b68.