stablerange: compute subranges from parent when possible Unless we are a merge, we can infer the standard subranges of a range by reusing the subranger of its parent. We update the implementation to do so. We still needs the "old way" for merge. We move that code in a dedicated function for the sake of simplicity.

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test-drop.t

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test-inhibit.t

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test-simple4server.t

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tests/test-simple4server-bundle2.t