Reproduction steps:

1. Open "MinimalRepro.zip" project
2. Set-up the project to use Perforce VCS
3. Check Out the "Townfolk-Adult-F-002.png"
4. Open it in the Sprite Editor
5. Slice out a new image
6. See that in the Hierarchy window, the scene is marked as dirty
7. See that in the Project window, the scene is not marked for Check Out

Expected Result: If the scene is dirtied by some action it should be Checked Out
Actual Result: The scene gets dirtied by editing a Sprite Atlas, but doesn't get Checked Out

Fixed in: 2019.1.0a10

Reproduced with: 2019.1.0a5, 2018.3.0b6, 2018.2.13f1, 2018.1.9f2, 2017.4.13f1,