* lisp/minibuffer.el (complete-with-action): Return nil for the metadata and
boundaries of non-functional tables. (completion-table-dynamic): Return nil for the metadata. (completion-table-with-terminator): Add default case, using complete-with-action. (completion--metadata): New function. (completion-all-sorted-completions, minibuffer-completion-help): Use it to try and avoid pathological performance problems. (completion--embedded-envvar-table): Return `category' metadata.
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