(setq gnus-sum-thread-tree-leaf-with-other "├─>"
gnus-sum-thread-tree-vertical "│ "
gnus-sum-thread-tree-single-leaf "╰─>")
(setq gnus-sum-thread-tree-leaf-with-other "|->"
gnus-sum-thread-tree-vertical "| "
(setq gnus-sum-thread-tree-leaf-with-other "├─>"
gnus-sum-thread-tree-vertical "│ "
gnus-sum-thread-tree-single-leaf "╰─>")
(setq gnus-sum-thread-tree-leaf-with-other "|->"
gnus-sum-thread-tree-vertical "| "