Search recursively in gzipped files. (Bug#4982)
(grep-highlight-matches): Add new options `always' and `auto'. Doc fix. (grep-process-setup): Check `grep-highlight-matches' for `auto-detect' to determine the need to compute grep defaults. Move Windows/DOS specific --colors settings handling to `grep-compute-defaults'. Check `grep-highlight-matches' to get the value of "--color=". (grep-compute-defaults): Compute `grep-highlight-matches' when it has the value `auto-detect'. Move Windows/DOS specific settings from `grep-process-setup'. (zrgrep): New command with alias `rzgrep'.
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