Clean up text distance code for diffs. #34
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Some diffs have a + or - followed immediately with a part of the line. I changed the code to check for things like ++ or --. But +def, etc. is ok. Also, I am not so sure about the check if the line length is >1. I have seen single + or -, e.g., +\n or -\n. When you split into lines, you get a single + or -. Don't these represent newlines being added or deleted?
Trying to make process_single_commit smarter about parsing changes. As noted in a comment, there still is a kluge with single + or - not followed by any text. I believe these represent the adding or deleting of blank lines in the file, e.g., for whitespace readability. I am adding a dummy space following these types of changes to they are not lost.
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See in particular the changes I made to patterns.py.
Linked to issue #35