Fix Porter stemmer failing on 'oed' #1582
Merged
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Fixes #1581, which was a regression caused by #1261
fievelk's analysis there is entirely correct; I missed an important length check from my function to see if a stem ends with a double consonant, and remarkably this didn't blow up on any of the tens of thousands of cases in the testing vocabulary. :(
All Porter tests now pass (including the new one, of course).