* fix: search inactive objects when setActive=true in modify
When trying to activate an inactive GameObject via manage_gameobject modify with setActive=true, the lookup would fail because inactive objects were not included in the search by default.
Now automatically sets searchInactive=true when setActive=true is specified, allowing inactive objects to be found and activated.
* fix: Add special handling for UIDocument serialization to prevent infinite loops (#585)
UIDocument.rootVisualElement contains circular parent/child references that
can cause infinite serialization loops. This adds special handling similar to
Transform and Camera components.
The fix:
- Safely serializes panelSettings, visualTreeAsset, sortingOrder, enabled, parentUI
- Explicitly skips rootVisualElement to prevent circular reference issues
- Includes a note explaining why rootVisualElement is skipped
Tested on Unity 2021.3 and Unity 6.3.
* refactor: Extract SerializeAssetReference helper and align UIDocument structure
- Add SerializeAssetReference() helper for consistent asset reference serialization
- UIDocument now uses same return structure as Camera (typeName, instanceID, properties)
- Reduces code duplication in special-case handlers
- Enhanced test coverage to verify structure matches Camera pattern
* fix: Handle UIDocument subclasses and add negative assertion for rootVisualElement
Address code review feedback:
- Add IsOrDerivedFrom() helper to detect UIDocument and any subclasses by walking
the base-type chain, ensuring derived types also get special-case handling
- Add negative assertion verifying rootVisualElement is NOT in serialized output
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