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Update Dotexporter.to_picture to work on Windows/Cygwin #1
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On Windows, the current "to_picture" function does not work as the temporary file name is not visible to the system. Therefore, calling "dot" on the command line will result in a FileNotFoundError. The fix changes the function so that on windows/cygwin, the file is not deleted until after the picture is made. Once the picture is made, the file in unlinked.
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On Windows, the current "to_picture" function does not work as the temporary file name is not visible to the system. Therefore, calling "dot" on the command line will result in a FileNotFoundError.
The fix changes the function so that on windows/cygwin, the file is not deleted until after the picture is made. Once the picture is made, the file in unlinked.