(tags-table-parent-pointer-list): Doc fix; elts are now 3-elt lists.
(tags-next-table): Save tags-table-list in tags-table-parent-pointer-list and then set it to tags-included-tables. Restore tags-table-list from tags-table-parent-pointer-list. (tags-find-table-in-list): Renamed from tags-table-list-member. Search included tables. Take new arg MOVE-TO; if t, frob list pointers. (tags-table-including): Save tags-table-list in tags-table-parent-pointer-list. Set tags-table-list to the passed TABLES value. (visit-tags-table-buffer): When CONT is nil, pop all tags-table-parent-pointer-list state before doing anything else. Don't do list frobnication when CONT is 'same. Call tags-find-table-in-list instead of tags-table-list-member; let it do list frobnication when it succeeds.
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