Custom glyphs for visualizing threads in Gnus summary buffer not working in all backends

Question

in the Gnus summary buffer I customized the threading appearance:

(setq-default
   gnus-sum-thread-tree-leaf-with-other "├── "
   gnus-sum-thread-tree-single-leaf "└── "
   gnus-sum-thread-tree-vertical "│ ")

When I'm reading my mail or mailing lists like emacs-devel via news.gmane.io it works as expected. Expected behaviour looks something like this as opposed to the default behaviour. Unfortunately I can't get this to work in nnhackernews and nnreddit. There threads just get indented by whitespace.

Does anyone how what I am missing here?

Answer 1

nnhackernews does set its own parameters for gnus-summary-line-format, see here.

It should work as intended if you change this to your default format string.