upgrade_pythoncapi: try to preserve newlines when patching #141
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In case we use \n on Windows or \r\n on Linux we don't want patching those files change every line due to newlines being adjusted to the platform defaults. Instead pass 'newline=""' to all open() calls to preserve newlines. And when adding new lines use the first type of newline found in the file. The test changes make the patching code reuseable and adds a second test with multiple different newlines in the input.
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In case we use \n on Windows or \r\n on Linux we don't want patching files to change every line due to newlines being adjusted to the platform defaults.
Instead pass 'newline=""' to all open() calls to preserve newlines. And when adding new lines use the first type of newline found in the file.
The test changes make the patching code reuseable and adds a second test with multiple different newlines in the input.