To reproduce:
1. Create a new project.
2. In a "Project window" create a folder.
3. Create "Cube" in hierarchy.
4. Select "New folder" in the Project window (with the small icon, right under "Favorites").
5. Press Edit, the first option is "Undo Create Cube". Selecting folder that way was not saved to the previous actions.
6. Now select "Assets", and select "New Folder" which is in the bigger area, with big icon.
7. Press Edit again, now the first option is "Undo Selection Change". This way, selecting a folder action was recorded.

Expected result: Selecting a folder under the "Assets" (below Favorites) should be undoable.
Actual result: Selecting a folder under "Assets" (below Favorites) is not undoable.

Reproducible with: 5.3.7p1, 5.4.3p1, 5.5.0f3, 5.6.0b4

Notes:
Because of that, undoing an action might throw user into a different folder than the one which was selected. (Just like in user's video)