Vanilla 1.1.9 is a product of Lussumo. More Information: Documentation, Community Support.
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We can't change that part of the software, only the StackExchange people can and they've stopped adding new features to the SE1.0 software.
Whenever (well, if I remember this defect in time) I post a comment with TeX in it, I copy before posting. Then, if I have to fix a typo, I just paste into a new comment box for that, and delete the original comment.