Fix permission denied while writing to temporary file on Windows #2
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This was caused by the file already being opened when instantiating the NamedTemporaryFile. Windows cannot handle this. See https://docs.python.org/3/library/tempfile.html#tempfile.NamedTemporaryFile and https://stackoverflow.com/a/23212515
This should fix johndoe31415/pdfminify#17. However, I usually do not code in python. Therefore review and test my changes carefully. I did not find any tests related to the method.
⚠️ These changes are untested because I lack the setup. ⚠️