I was reading a question from another SE site — I fell for the sugar daddy scam:
So, long of the short. They offered to pay off my meager credit card debt. I was able to cancel all the payments but one. […]
What does “long of the short” mean?
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The idiom in English is "the long and the short of it". It means "brief summary that includes only the most important points". It is colloquial and perhaps a little dated.
Well, the long and the short of it: The company went bust and he lost his job. But it meant he had time to start his own business, and now he's doing better than ever.
The use in the post is likely an error. But it means the same, it introduces a short summary of the most important facts.
The is a variation of the idiom "a long story short," which means rather than telling you the full details of what happened (the long story) he is just telling you a short summary of what happened. In this case it is the opposite - he is making a short story long - so, rather than giving you the brief summary, he is giving you the full details. Likely they are referring to the "short" story being the title of the question, and then the body being the long version.