Mouse cursor on disabled/enabled widgets

Hello
I'm using Qt version 5.5 and 5.6beta on Windows platform.

I have a question about mouse cursor.
I have some widget with non standard mouse cursor.
When I move mouse cursor over this widget then cursor shape is changed properly.
When I disable this widget an I move mouse cursor over this widget, then mouse cursor shape doesn't change and this is properlly too.
But when the widget is disabled and my mouse cursor is over this widget then this widget change state to enabled (for example by QTimer) and mouse shape is still set to default, not to my custom cursor shape.

It is properly behavior or not ?

Thanks for Your reply!