(todo-insert-item-here): Prevent insertion
of a new entry inside of an existing entry. Minor code cleanup. (todo-add-category): Change the interactive spec. Signal an error if the Todo file is non-empty but contains no category. Reject category names that could induce bugs and confusion. Call todo-mode if the Todo file is new and unsaved. Simplify handling of local variables cookie. Properly display the newly added category in Todo mode. (todo-show): Call todo-initial-setup only if there is neither a Todo file nor a corresponding unsaved buffer. (todo-category-alist): Delete function. (todo-completing-read): New function. (todo-insert-item, todo-jump-to-category): Use it. (todo-insert-item): Make the use of the prefix argument conform to the doc string.
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