gh-70999: Preserve caller vars in ExtendedInterpolation nested interpolation - #155880
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gh-70999: Preserve caller vars in ExtendedInterpolation nested interpolation#155880nikolauspschuetz wants to merge 1 commit into
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…interpolation ExtendedInterpolation honoured caller-supplied ``vars`` only at the first level of interpolation. When a value referenced another option in the same section, the recursive call rebuilt the lookup map from ``parser.items(section, raw=True)``, discarding the map that carried ``vars``. Mirror BasicInterpolation, which threads the same ``(section, map)`` through recursion, by reusing ``map`` when the reference stays in the current section and only rebuilding it when crossing into another section (so ``vars`` do not leak across sections).
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ExtendedInterpolationhonoured caller-suppliedvarsonly at the first interpolation level. When a value referenced another option in the same section (e.g.a=${b},b=${c}), the recursive call rebuilt its lookup map from the section and dropped the one carryingvars, socfg.get('s', 'a', vars={'c': 'x'})returned the configuredcinstead ofx.Reuse the caller's map for same-section references — mirroring
BasicInterpolation, which already threads the same map through recursion — and only rebuild it when crossing into another section, sovarsdon't leak across sections. Adds a regression test.Fixes #70999