bug#47437: 28.0.50; pulse-momentary-highlight-overlay breaks if background color is inherited

[Ingo Lohmar]

The bug surfaces after setting the pulse highlight face by inheriting
from other faces (no explicit background attribute), for example like
this:

(custom-set-faces
 '(pulse-highlight-start-face ((t (:inherit highlight))) 'new))

I do this as I employ a restricted set of color faces from which all
others inherit.  With the above setting, run `xref-find-definitions'
(M-.) on an elisp symbol.  This triggers
`pulse-momentary-highlight-overlay', which fails at

    (color-name-to-rgb
     (face-background 'pulse-highlight-start-face))

because the background attribute is `nil'.  Adding the "inherit"
argument works, at least in the above case:

    (color-name-to-rgb
     (face-background 'pulse-highlight-start-face nil t))

Thanks!


In GNU Emacs 28.0.50 (build 5, x86_64-pc-linux-gnu, GTK+ Version 3.24.24, cairo 
version 1.16.0)
 of 2021-03-27 built on kenko
Repository revision: 5d2f319eec33fea2cb29a02210952ee590b4b21b
Repository branch: feature/pgtk
Windowing system distributor 'System Description: Debian GNU/Linux bullseye/sid

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