Actually, I cannot understand why this edit had been rejected.
Didn't the post have formatting problems? Or my edit was minor?
Reviewer Blumer decided to improve your suggested edit. Looking at the rendered output view, it seems your edit caused quite some trouble with the code block. It inserted a horrendous amount of spacing. Looking at the original source, this is actually not your doing. The spacing was already there, but not apparent until after your correction.
This user went in and corrected that and ultimately decided that your suggestion was not helpful. Most likely since it seemed you created a mess. This most likely caused the rejection.
The hint is this line:
Blumer reviewed this 9 mins ago: Edit
Someone edited your edit, so the original edit was "rejected". Never fear -- your changes were accepted, just not in their original form.