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Eli Zaretskii authored
lisp/net/mairix.el (mairix-replace-invalid-chars): Rename from mairix-replace-illegal-chars; all callers changed. Don't remove ^, ~, and = characters: they are meaningful in mairix search specs. (mairix-widget-create-query): Add usage information about mairix search forms: negating words, searching for substrings, etc.
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