How to change particular tab child of a GtkNotebook

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I will still need to do a lot of expensive work to remove add and
reconfigure all the child widgets (which are a lot), also
I will need to be doing even more work to define the switch-tab behavior,
which will involve keeping track of the latest tab content (to know where
to remove the child widgets from). It is still somehow better than creating
all the widgets again, copying their condifiguration.


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