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c993857752
The 2024 guard against runaway recursion in _find_image_xrefs_container only deduplicated image xrefs, but Form XObject xrefs are never added to include_xrefs/exclude_xrefs, so a self-referential or DAG-shaped Form graph re-entered every branch until the depth limit fired -- producing the reported flood of warnings (and minutes-long hangs) on PowerPoint exports. Thread a visited_forms set through the recursion so each Form XObject is descended into at most once per document. With memoization in place the depth limit is no longer a cycle defense, so demote its log to debug. Add a regression test that synthesises a circular-Form PDF from the existing formxobject.pdf fixture (no new binary fixture, no license issues) and asserts zero "Recursion depth exceeded" warnings.