If you run git log -c this implies the -p flag. But git log -r does not imply -p, even though both -r and -c are flags which exist to 'control the formatting of diff output' according to the documentation.
I think that all the flags listed in that section should implicitly turn on -p if it wasn't given. (I'd also be content if they died with an error when -p wasn't given, but that could break existing users.) The current behaviour is inconsistent and a bit of a headscratcher when 'git log -r' produces the same output as plain 'git log'.
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