Fix sphinx-doc#11410: autodoc: can't detect overloads for functions defined in other file #12061
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Subject: fix autodoc not detecting overloads defined in other module, but exported in this module.
Feature or Bugfix
Purpose
Detail
This PR fix is based on the solution used in #8283. Currently, the Documenter class gets overloads defined in the same file, and records the real/source module as a dependency, and then nothing else.
The fix provided here adds overloads defined in the "real" module to the public module.
I'm not entirely sure if this is the "right" way to go about this, but it's the simplest solution without a refactor.
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