fix: py_proto_library: append to PYTHONPATH less #1553
Merged
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Only append the
[proto_root]to PYTHONPATH when it's actually necessary, i.e. when the generated Python modules are under _virtual_imports. Do no append it in the general case, when[proto_root]is just the repository root.This makes it much less likely that adding a transitive dep on a
py_proto_librarywill reorder thePYTHONPATH. Such reordering is undesirable because it may lead to import errors.Fixes #1551