ID 491731 - "Autosaving..." label is not shown when autosaving is in progress

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Problem summary
During an autosave (crash file save) the UI is blocked and there is no indication of the reason.
 
Priori to D245 (ID:47124 and ID:171824), the main window title and the project filename label were updated to indicate when an autosave was taking place. As part of D245 a new 'Autosaving...' label was added to the top layout and is intended to be shown during an autosave, but is not. The below image depicts how the label should appear.




Customer reported version
Katana N/A

Customer reported platform

Steps to reproduce

1) Add a node to a new scene

2) Look for the "Autosaving..." label
 
Note that it is possible to trigger an AutoSave with the following snippet, however doing so from the Python tab may affect the visibility of the label and so should not be relied upon for verification:
 

from UI4.App import AutoSaveAutoSave._AutoSave()

Expected behaviour
The "Autosaving..." label is present when an autosave is in progress.

Actual behaviour
There is no indication of an autosave being in progress.

Workaround
Unknown

Reproduced by support
This bug has been reproduced in:
Katana 4.0v5 - Windows 10
Katana 3.6v1 - Windows 10
Katana 2.1v1a1 - CentOS 7

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