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(Completion Options): Document the significance of a trailing slash
in elements of completion-ignored-extensions.
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@ -363,6 +363,14 @@ However, if @emph{all} the possible completions end in ``ignored''
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strings, then they are not ignored. Ignored extensions do not apply to
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lists of completions---those always mention all possible completions.
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If an element of the list in @code{completion-ignored-extensions} ends
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in a slash @file{/}, it indicates a subdirectory that should be ignored
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when completing file names. (Elements of
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@code{completion-ignored-extensions} which do not end in a slash are
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never considered when a completion candidate is a directory; thus,
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completion returns directories whose names end in @file{.elc} even
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though there's an element @code{".elc"} in the list.)
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@vindex completion-auto-help
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Normally, a completion command that cannot determine even one
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additional character automatically displays a list of all possible
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