Line span on PR comment doesn't understand old vs. new line numbers

[pzagieboylo]

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Bug

Body

I tried to add a comment on a PR, spanning a few deleted lines and a couple of added lines that replaced them. However, because of a bunch of lines deleted earlier in the file, the deleted line numbers were higher than the added line numbers. This completely confused the comment system, because it was determined that the "end line" had to be greater than the "start line", and it wasn't happy with a comment spanning from "old line 143" to "new line 129" despite having a matching line in between.

Reproduction Steps

Have a PR with several lines deleted near the beginning, and some changes later on.

Try to save a comment starting on a deleted line and ending on an added line (with a lower line number, despite being displayed later).

Additionally, I tried to report this through the only channel GitHub actually provides for support and was told I didn't have access to that (despite clearly having access to that), which seems... misguided.

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