Changes to support filenames as tags too and provided
a drop-in replacement for list-tags. (find-tag-noselect): Recognize filenames as valid tags too. (find-tag-file-order): New variable holds function to check for match for a file name used as a tag. (last-tag-file): New variable; stores the filename looked for via find-tag family of functions. (find-tag-in-order): If the tag is a file name, position at file beg. (etags-recognize-tags-table): Added new var find-tag-file-order to tags-table-format variables. Added tag-filename-match-p to the list for find-tag-tag-order. (tag-filename-match-p): New function. (list-tags): Rewritten for speed. (tags-list-functions-in-file): New subroutine for list-tags. (tags-locate-file-in-tags-table): New function locates a file in `tags-table-list'.
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