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This commit makes a small tweak to the --max-columns flag. Namely, if the value of the flag is 0, then ripgrep behaves as-if the flag were absent. This is useful in the context of ripgrep reading configuration from the environment. For example, an end user might set --max-columns=150, but we should permit the user to disable this setting when needed. Using -M0 is a nice way to do that. We do this because a zero value for --max-columns isn't particularly meaningful. We do leave the --max-count, --max-filesize and --maxdepth flags alone though, since a zero value for those flags is potentially meaningful. (--max-count even has tests for ripgrep's behavior when given a value of 0.)