The Ability to Import Compatible Assets While Maintaining Original Folder Structure No Longer Functioning

Before UE4.12 A user could drag a folder and its sub-directories from the Finder in Windows into the Content Browser and it would keep the folder structures. Now, doing the same results in the assets being imported with no folders at all. This is impeding some people's workflow.

Regression: This did not occur before UE4.12

1. Start by finding or creating a folder with raw assets: Materials, FBX files, Texture.tga's (Not uasset files.)
2. If not done already, separate files into sub-directories (Main folder - asset 1 + contained folder1 -asset 2 + contained folder 3 -asset 3 etc.)
3. Open a Blank UE 4.12 project
4. Drag the folder into the Content Browser
   RESULT: Contents of folders (assets) are imported without their containing folders
   EXPECTED: The assets to be imported in their original folder hierarchy (as in previous versions of the engine.)

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