Marc Gilleron 22fcdffd17 Make GraphNode::_validate_property protected so GraphNode can be inherited. ...

It's not about overriding or accessing `_validate_property`,
but since `_validate_property` became a multilevel method,
the GDCLASS macro now tries to access the one from the parent class,
which causes a compiling error if the parent class declares
`_validate_property` as private.

2022-08-24 21:29:32 +01:00

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