Edits missed for a substitute -> Delete -> Substitute sequence.

[codedecde]

Hi.
I am running into the following error:
For the source, target pairs:

source: In the article mrom The the New York Times.
target: In the article from The New York Times.

The edit mrom -> from is missed by ERRANT. The output from ERRANT was:

["Orig: [4, 6, 'The the'], Cor: [4, 5, 'The'], Type: 'U:DET'"]

On digging a little, it seems to be the issue with all alignment types of the following form

Input: w1 w2 w3
Output: w4 w5
such that w3.lower() == w5.lower()

Alignment Sequence: S w1 -> w4, D w2 -> "", S w3 -> w5

Then the edit "w1" -> "w4" is missed, and "w2 w3" -> "w5" is generated by errant.en.merger.process_seq
Example:

source: "In thir the"
target: "On The"
Errant Output: ["Orig: [1, 3, 'Thir the'], Cor: [1, 2, 'The'], Type: 'U:NOUN'"]
# Missing In -> On

[chrisjbryant]

Hey, good catch!

<Previous solution>

Edit: The solution I posted previously works, but might have some unintended side effects, so I just fixed the brackets as in #26, which also works.

[codedecde]

Awesome ! Thank you : )

[chrisjbryant]

Turns out this was actually the same issue as in #26 and I just needed to fix some brackets. I've edited my answer above accordingly!