Split from T44616, diffs of the removal of trailing newlines should work, even though such diffs are rare. Example diff: https://test.wikipedia.org/w/index.php?title=Some_page_title&diff=prev&oldid=152897.
This diff should show that the page went from #REDIRECT [[Foo]]\n\n to #REDIRECT [[Foo]]\n. Instead, it pretends as though there were no changes to the wikitext of the page at all! This is incorrect diff behavior.
Version: 1.34.x
Severity: minor
This is also true for diffs of trailing newline additions, and I've modified the summary accordingly:
http://en.wikipedia.org/w/index.php?title=Radiation_therapy&diff=543259144&oldid=543259121
Also see this discussion:
http://en.wikipedia.org/wiki/Wikipedia:Vpt#Bizarre_null_edit_thingy
I believe this same issue changes \r\n to \n without a visible diff, but I'm not completely sure.
I noticed this bug with this diff. I have to wonder if at some point the software is trimming the wikitext.