If you know the place in the code, you do a git blame on the file. It will show for each line, when it got modified the last time. So you can simply click on the commit. I think it’s here:
which leads to commit:
Search the page with CMD-F for AAX and load the diff, because it is a big commit git will not load all file diffs. But you can click there on “Load diff” and see I think around L135
I don’t know, if that’s the exact place you are looking for, but maybe it helps searching…