1. Open a new Unity project
2. Enable collab
3. Create two scripts "a.cs" and "b.cs"
4. Commit the scripts to collab
5. Add a comment to both scripts
6. Try to revert asset changes at the same time (see image)
Expected: Second asset to be reverted is put in a queue and gets reverted after the first one is done.
Actual: "Operation is already running" error bar appears, second asset is not reverted.

Reproduced on: 5.5.1p1, 5.6.0b5
Didn't reproduce on: 5.4.4f1 (the warning about reverting the asset closes if you click "Revert asset" on another asset)