bug#40520: 28.0.50; Prevent duplicate thread titles in Gnus

[Lars Ingebrigtsen]

Kévin Le Gouguec <kevin.legouguec@gmail.com> writes:

> Ideally, I would like for loose threads to show the subject only once,
> on the dummy root line.  IIUC, "%S" in gnus-summary-dummy-line-format
> and "%s" in gnus-summary-line-format should get me that; quoting the
> latter's docstring:

[...]

> -           (setq gnus-tmp-prev-subject gnus-tmp-header))
> +           (setq gnus-tmp-prev-subject (gnus-simplify-subject-fully 
> gnus-tmp-header)))

Looks good to me; applied to Emacs 28.1.

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