Added a comment: update 4: union is correct

diff --git a/doc/todo/Adding_unmatched_files_to_a_view/comment_7_951de7e01709d19a01175e44e3fc3b7f._comment b/doc/todo/Adding_unmatched_files_to_a_view/comment_7_951de7e01709d19a01175e44e3fc3b7f._comment
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+[[!comment format=mdwn
+ username="psxvoid"
+ avatar="http://cdn.libravatar.org/avatar/fde068fbdeabeea31e3be7aa9c55d84b"
+ subject="update 4: union is correct"
+ date="2024-12-20T07:27:43Z"
+ content="""
+After even closer inspection, `_` works as expected indeed.
+
+The reason why I was confused is that some folders with `tag-b` were appearing in `_` because this folder was containing `.jpg.jpg` probably produced by accident or are thumbnails generated by some app.
+"""]]