Hello,
the window in the dockingmanager are highlighted with a color, but there seems to be an inconsistency when using nested dockingmanager.
I checked it with version 18.2.0.44 and the example in Docking Manager\NestedDockingManager\CS and i also have the same problem in my project.
If you click inside a nested dockingmanager window it gets hightlighted. If you then click outside of it and the reclick it again, it doenst get hightlighted anymore. I havent checked if this also affect any properties of the nested dockingmanager (for example current activeitem or events)
It just gets hightlighted again, if you change focus to another window inside the nested dockingmanager
To make this more clearer, here a some pictures with steps to reproduce
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Can you confirm if this is a bug or is this the intented behaviour?