[Qt-creator] Shortcut CTRL-Left in Design view does not work after adding copyright notices to .ui files

[Robert Hairgrove]

I am using Qt Creator 4.12.2 on Linux Ubuntu 18.04 LTS.

When editing a UI form in Designer view, I can normally return to the 
last source file edited in Edit view and not have the XML representation 
of the UI file presented to me in an editor with the warning "This file 
can only be edited in design view", etc. by pressing the CTRL+Left Arrow 
key. This is very convenient when setting up signals and slots.

According to the XML Schema for .ui files shown in the documentation for 
Qt 5, it is possible to add a <comment> element under the <ui> element 
in the file which can be used to include copyright notices, etc. 
However, after adding the <comment> element, the shortcut described 
above does not work anymore, and I have to manually quit the UI file.

Is this a known bug?

It would be nice if it were possible to add such comment elements 
directly in Designer and not have to edit the file outside of Qt 
Creator. I didn't see any other way to do this, though. Is there a way?