Mac: Folders created by git are not expanded after git command completes

[wilbaker]

This issue can be reproduced by running the CheckoutTests.DeleteFileThenCheckout functional test.

The test fails because when TestValidationAndCleanup runs the repo is in this state:

• GitCommandsTests/DeleteFileTests/1/#test is in ModifiedPaths.Dat
• GitCommandsTests/DeleteFileTests is not on disk

Then TestValidationAndCleanup checks out the control commit (which does have GitCommandsTests/DeleteFileTests, and it has several child folders).

When the checkout occurs git creates DeleteFileTests, DeleteFileTests/1, and DeleteFileTests/1/#test. When git creates the folders (unlike in VFSForGit on Windows) the folders are not marked as empty (or recorded as needing to be re-expanded).

As a result, when the command completes DeleteFileTests (and DeleteFileTests/1) are never expanded again and all of their children (other than #test) are missing.