tag names

(#<widget> 'tag 'names ?index?)
Returns a list whose elements are the names of all the tags that are active at the character position given by index. If index is omitted, then the return value will describe all of the tags that exist for the text (this includes all tags that have been named in a (#<widget> 'tag ...) widget command but haven't been deleted by a (#<widget> 'tag 'delete ...) widget command, even if no characters are currently marked with the tag). The list will be sorted in order from lowest priority to highest priority.

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