ID 377798 - When using the keyboard shortcut "Ctrl + Tab" to open the Tool HUD, the HUD closes each time a tool is added to or removed from the HUD

Problem summary

When using the keyboard shortcut "Ctrl + Tab" to open the Tool HUD, the HUD closes each time a tool is added to or removed from the HUD. 

Customer reported version
Modo 12.2v1 

Customer reported platform
MacOSX 10.14

Steps to reproduce

1) Open Modo. 

2) Use the keyboard shortcut "Ctrl + Tab" to open the Tool HUD. 

3) In the Tool HUD, remove or add any tools and now the HUD gets closed each time.

4) Press "O" to open the 3D Viewport Properties and go to the HUD tab. Notice that the "Show Viewport HUD" option has been disabled without using the shortcut. 

Workaround
Enable the "Show Viewport HUD" option in the HUB tab of the 3D Viewport Properties or move the HUD around after opening it with "Ctrl + Tab". 

Reproduced by support

This bug has been reproduced in:
Modo 12.2v1 - Windows 10 - MacOSX 10.13 - CentOS 7 

Modo 12.1v2 - Windows 10 

Modo 12.1v1 - Windows 10 

Modo 12.0v1 - Windows 10 

Modo 11.2v3 - Windows 10 

Modo 11.1v1 - Windows 10 - MacOSX 10.13 - CentOS 7 - regression 

Unable to reproduce bug in:

Modo 11.0v3 - Windows 10 - MacOSX 10.13 - CentOS 7

Earliest version tested
Modo 11.0v3 - This issue no longer appears in this version and has regressed.

Expected behaviour
The Tool HUD should not close each time a tool is added or removed after using the keyboard shortcut "Ctrl + Tab" to open the HUD. 

Actual behaviour
The Tool HUD closes each time a tool is added or removed after using the keyboard shortcut "Ctrl + Tab" to open the HUD.