Fixes #3652. Setting Menus causes unexpected Exception. · gui-cs/Terminal.Gui@7613cd2

The member 'Label.FocusNext()' does not hide an accessible member. The new keyword is not required.

Converting null literal or possible null value to non-nullable type.

Converting null literal or possible null value to non-nullable type.

Dereference of a possibly null reference.

Non-nullable property 'CommandImplementations' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Call to non-readonly member 'Thickness.Left.get' from a 'readonly' member results in an implicit copy of 'this'.

Call to non-readonly member 'Thickness.Top.get' from a 'readonly' member results in an implicit copy of 'this'.

Call to non-readonly member 'Thickness.Right.get' from a 'readonly' member results in an implicit copy of 'this'.

Call to non-readonly member 'Thickness.Bottom.get' from a 'readonly' member results in an implicit copy of 'this'.

Non-nullable field '_increment' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

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