bpo-35376: Fix modulefinder skipping some nested modules #10895
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If modulefinder finds a nested module import (eg. 'import a.b.c') while there is a top-level module with the same name (eg. 'c') that failed to import and got added to the badmodules list, it will skip it entirely without even trying to import it.
The right thing to do is clearly to check it by fqname in the badmodules dict since that's also what it expects in other locations.
I think this merits backporting, but I'll wait until further instructions before I file PRs against the maintenance branches.
I assume this does not need a NEWS.d mention given the insignificance of this fix.
https://bugs.python.org/issue35376