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f003911967
Fixes #115525. On [AbstractNode.detach] and its two progeny [RenderNode.detach] and [Layer.detach], the docs said both to call the inherited method before detaching children, and to end by doing so. The former advice is what's enforced by an assertion in the base implementation, so cut out the other. The corresponding [attach] methods redundantly said twice to call the inherited method first, so cut the redundancy. Leave in place the version more recently added (in #76021), because that PR shows the old version must have been easy to overlook.