Overall speedup when using many buffers.
(uniquify-fix-item-base, uniquify-fix-item-filename, uniquify-fix-item-buffer): Changed defmacro to defalias (cosmetic change). (uniquify-fix-item-unrationalized-buffer): Deleted: was the fourth place in the item, but waas never used. (uniquify-fix-item-min-proposed): New defalias: the fourth place in the item is now used as cache for the proposed name. (uniquify-rationalize-file-buffer-names): Move computation made on newbuffile out of the loop, in the newbuffile-nd local var. Use dolist (cosmetic change). Compute the proposed name for the most common case and cache it in the fourth place in the item. (uniquify-rationalize-file-buffer-names): Used to return a list of flags indicating renamed buffers, but that return value was never used. (uniquify-item-lessp): Replaces uniquify-filename-lessp, works on the cached proposed name, does much less consing and is quicker. (uniquify-filename-lessp): Deleted. (uniquify-rationalize-a-list): Use dolist (cosmetic change). Do not bind locally the uniquify-possibly-resolvable flag. Use the cached proposed name if possible. (uniquify-get-proposed-name): Arguments changed, callers changed. (uniquify-rationalize-conflicting-sublist): Explicitely reset the uniquify-possibly-resolvable flag, which is no more bound locally. (uniquify-rename-buffer): Do not set the unrationalised-buffer flag, which is replaced by the cached proposed name.
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