Rémi Verschelde 09a6a2d8f8 Signals: Port more uses of connect_compat ...

Those were problematic as they call a method of their parent class,
but callable_mp does not allow that unless it's public.

To solve it, we declare a local class that calls the parent class'
method, which now needs to be protected to be accessible in the
derived class.

2020-02-28 14:24:09 +01:00

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