Repro steps:
1. Open user attached project
2. Go to "Assets/ImportToHere"
3. Right-click in the folder and in the context menu select "Mass Import"
4. In the explorer window choose the "MassImportThisFolder" folder which is right next to the project folder and wait for the assets to be imported
5. Without clicking anywhere else go to the "Textures" folder
6. Observe the content of the folder and notice the "New Painter Material" asset in renaming mode
7. Click anywhere in the folder

Expected: The "New Painter Material" is created in the "ImportToHere" folder and not in the "Textures" folder
Actual: The "New Painter Material" is created in the "ImportToHere" folder and after clicking anywhere the Project Window's view and the material are moved back "ImportToHere"

Reproducible with: 2017.4.12f1, 2018.2.10f1, 2018.3.0b3, 2019.1.0a2

Notes:
- Importing only ~1-3 textures from the MassImportThisFolder works fine