StringPicker/ImagePicker causes the inspector GUI to collapse.

There is a bug in some versions of Unity released in 2021-2022 that causes the inspector GUI to collapse.

https://answers.unity.com/questions/1828499/nested-class-lists-inspector-overlapping-bug.html

https://issuetracker.unity3d.com/issues/scriptableobject-with-an-array-of-serializable-classes-with-arrays-in-them-is-overlapping-in-the-inspector-when-expanded

Either of the following two methods can solve the problem.

• Upgrade the Unity version

  If possible, we recommend this method.
• Avoid drawing the problematic GUI

  Add UNITY_yyyy_m_j to enable the preprocessor NESTED_LIST_HAS_BUG at the beginning of the following file.

  PickerForUGUI/Editor/Util/PickerEditor.cs

  The problem GUI component will no longer be used.