Re: bug#47391: 27.2; static list return from function and nconc

[Gregory Heytings]

> (defun fn () '(1 2))
>
> (nconc (fn) '(3))
> -> (1 2 3)
>
> (nconc (fn) '(3))
> -> (1 2 3 3) ? should be (1 2 3)

Why do you think this is a bug?  The docstring of "nconc" says: 
"Concatenate any number of lists by _altering_ them.  Only the last 
argument is not altered, and need not be a list."  (append (fn) '(3)) 
always returns (1 2 3).

> If this is not a bug, then hfy-invisible, hfy-face-to-style-i may need 
> to be fixed.

Does the attached patch fix the bug you see?

0001-lisp-htmlfontify.el-hfy-invisible-Return-a-new-list-.patch
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