diff: --quiet does not imply --exit-code if --diff-filter is present

[Yasushi SHOJI <yashi@xxxxxxxxxxxxxxxxx>]

Hi,

just noticed that quiet does not return exit code when I set
diff-filter.  at the current tip (v1.7.5.3-401-gfb674d7):

  git diff --quiet     --diff-filter=A v1.7.5 v1.7.5.1 -- t  #=> 0
  git diff --exit-code --diff-filter=A v1.7.5 v1.7.5.1 -- t  #=> 1

these two line returns different exit code.

is this a bug or a feature?

Thanks,
-- 
           yashi
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