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Miles Bader authored
(grep-command): Mention `grep-use-null-device'. (grep-compute-defaults): Compute `grep-use-null-device' if necessary. Make computation of `grep-command' respect `grep-use-null-device'. (grep): Respect `grep-use-null-device'. Call `grep-compute-defaults' even if grep-command is set, if grep-use-null-device is still tentative.
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