Widgets without a dock location should stick to widgets with a dock location

[tlaemmlein]

System: Windows 10 / VS 2019
kddockwidgets version: 1.6.0 with bug fix: #96

Steps:

• Open a floating widget and dock it to the main window
• Open another floating widget. Hence it doesn't have a dock location
• Undock the first widget
• Tab the second to the first widget
• Click on the dock button
• Observe the first widget will be docked but the second remains as a floating widget

Is it not logic that both widgets should be docked?
I understand it will be complex to have a similar behvaiour for already docked widgets.
But I see this issue 'only' for non-docked widgets.
It is a kind of grouping feature request.

Kind Regards,
Thomas