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Multiple Assets with identical GUIDs are not assigned new ones if they are added at the same time

Editor - Other


Repro steps:

1. Open ""
2. In File Explorer copy the "Assets\enUS" subdirectory. This will create two assets with the GUID of '5cdfad47a23471445b74de1eaeecf376'
3. Switch back to Unity
4. Notice the warning output in the Console:
"The GUID for Assets/enUS - Copy/VO_...wav is already in use by Assets/enUS/VO_...wav. Assigning a new guid.". (This is correct.)
5. Open up "Assets\enUS\VO_...wav.meta" and "Assets\enUSCopy\VO_...wav.meta" with a text editor and note that the GUID has been changed and they now have different GUIDs.
6. In File Explorer copy the "all-together" folder into the Assets folder. This is a similar situation, there are three assets inside with the same GUID "ac8628a9645a32549a87f20955051199"
7. Switch back to Unity.
8. Notice there is no message about a GUID already in use in the Console
9. Open up "Assets\all-together\test-deDE\VO_...wav.meta", "Assets\all-together\test-enUS\VO_...wav.meta" and "Assets\all-together\test-esES\VO_...wav.meta"
in a text editor and note that all the GUIDs are still the same value "ac8628a9645a32549a87f20955051199"

Expected Result: The three copied assets should be assigned new GUID's/A warning should apear that there are assets with the same GUID
Actual Result: The GUID's are the same as the original files/ No Warning for same GUID's appear if asset isn't in the Assets folder.

Reproduced with: 5.5.4p2, 5.5.0f3, 5.4.5p4, 5.3.8f1
Did not reproduce on: 2017.2.0b3, 2017.1.0f3, 5.6.2p4, 5.6.0p4

Fixed in: 5.6

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