Hello,

Some themes add a background to the faces Gnus uses to highlight summary
lines (e.g. gnus-summary-selected, gnus-summary-cancelled); I'd like to
be able to extend that background beyond EOL.

Right now Gnus only applies these faces right up to the char *before*
EOL; if it were to apply them one char further, users could then set (or
unset) the :extend property on these faces.

I'm attaching a patch only for demonstration purposes; I do not know
whether it should be applied as-is.  It does Work For Me®, but:

(1) Maybe we want to be as flexible as Org, i.e. let users control this
behaviour with a user option instead of messing with faces.
(Cf. org-fontify-whole-heading-line in org-set-font-lock-defaults)

(2) I haven't looked at the whole beg/end vs. from/to vs. mouse-face
affair in gnus-highlight-selected-summary, so my patch may fail to DTRT
in some circumstances… ?


Thank you for your time.