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Prefab is marked as unsaved if LayoutGroup components are attached to it when saving the Prefab manually
Steps to reproduce:
1. Open the attached project "case_1212004-PrefabBug.zip"
2. In the Project window open the Prefab "UIPrefabBug"
3. Save the Prefab and Exit Prefab Scene
4. Repeat step 2
Expected results: Prefab is saved when manually saving
Actual results: Prefab is not saved and is marked as "Dirty"
Reproduced with: 2018.4.16f1, 2019.2.19f1, 2019.3.0f5, 2020.1.0a20
Could not test with 2017.4.36f1 due to Prefabs not having their own Scene view
-Issue is not present if "Auto-save" is turned on in the Prefab Scene view
-Disabling the LayoutGroup component fixes the issue
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