SequenceMatching without indents?

[Aaron Bentley]

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+        else:
+            return DotsProgressBar(to_file=to_file, **kwargs)
     else:
- -        return DotsProgressBar(to_file=to_file, **kwargs)
- -

I hate bogus matches like this.  I'd rather see

+        else:
+            return DotsProgressBar(to_file=to_file, **kwargs)
+     else:
+ <more stuff>...
- -     else:
- -        return DotsProgressBar(to_file=to_file, **kwargs)

What if we stripped leading indents before generating the sequence, then
 checked whether matches were true before emitting them as matches?

e.g.

a
b
c
d

a
  b
c
b
e

would initially match as [(0, 0, 3)], but that would be converted to
[(0, 0, 1), (2, 2, 1)]

Aaron
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