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Copy paste item to another project's subfolder doesn't include file in project
Create 2 projects in a solution:
In solution explorer:
Select module1.py from PythonSource project
Select MySubFolder from PythonTarget project
If you don't have show all files enabled, you'll think nothing happened. If you have it enabled, you'll see the file was copied, but it's not included in the project.
Note: If you try to paste on PythonTarget project node, instead of a subfolder, it will work as expected.