9a252c2e73
Remove a workaround for #23871 which manipulated the module to prevent classes defined in the text editor from having their name-space cleared. This caused the "multiprocessing" module to store the "__main__" module as "__mp_main__" for later use. Accessing attributes from this module would then attempt to read from with a null "mp_dict" which crashed. This happened when showing the extensions preferences but would have occurred if "__mp_main__" was accessed from elsewhere too. Resolve by removing the workaround since it has not been needed since Python 3.2.
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