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

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

Ingo Lohmar-2

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

 '(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

     (face-background 'pulse-highlight-start-face))

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

     (face-background 'pulse-highlight-start-face nil t))


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

Configured using:
 'configure --with-pgtk'

Configured features:

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: ELisp/l

Minor modes in effect:
  TeX-PDF-mode: t
  TeX-source-correlate-mode: t
  ess-elisp-trace-mode: Toggle tracing of ess-prefixed functions.
Tracing is useful for debugging background ESS behaviour. When
enabled, all functions prefixed in `ess-' and `inferior-ess' are
instrumented with `trace-function'. Tracing is turned off by
calling `untrace-function' on these functions.
  company-skewer-mode: t
  global-git-commit-mode: t
  hi-lock-mode: t
  server-mode: t
  display-fill-column-indicator-mode: t
  subword-mode: t
  idle-highlight-mode: t
  rainbow-delimiters-mode: t
  goto-address-prog-mode: t
  shell-dirtrack-mode: t
  outline-minor-mode: t
  global-hl-todo-mode: t
  hl-todo-mode: t
  dired-async-mode: t
  pollen-global-mode: t
  xterm-mouse-mode: t
  enchive-mode: t
  selectrum-prescient-mode: t
  prescient-persist-mode: t
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  savehist-mode: t
  minibuffer-depth-indicate-mode: t
  company-posframe-mode: t
  company-statistics-mode: t
  global-company-mode: t
  company-mode: t
  beginend-global-mode: t
  beginend-prog-mode: t
  delete-selection-mode: t
  show-paren-mode: t
  electric-pair-mode: t
  which-key-mode: t
  desktop-save-mode: t
  my/window-number-mode: t
  ws-butler-global-mode: t
  ws-butler-mode: t
  global-auto-revert-mode: t
  global-so-long-mode: t
  ctrlf-mode: t
  ctrlf-local-mode: t
  selectrum-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  global-prettify-symbols-mode: t
  prettify-symbols-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t
  hs-minor-mode: t

Load-path shadows:
None found.

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

Eli Zaretskii
> From: Ingo Lohmar <[hidden email]>
> Date: Sat, 27 Mar 2021 22:34:46 +0100
> 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, I made that change on master now, except that I used 'default'
instead of t, to make sure the returned value is always a color name.

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

Eli Zaretskii
> From: Ingo Lohmar <[hidden email]>
> Date: Sun, 28 Mar 2021 14:58:15 +0200
> 1) I would have suggested to use 'default' myself, if the docstring of
> `face-background' were not (IMHO) misleading: The paragraph describing
> INHERIT (wrongly) suggested to me that giving a face would also
> disregard the :inherit attribute.
> The same applies to the other helper functions (`face-foreground' etc).
> The docstring of `face-attribute' is clearer ("further merged") about
> the fact that inherit is still followed in the non-t case.
> I suggest to amend the last sentence in the inherit paragraph of all
> these docstrings, from
> "If INHERIT is a face or a list of faces, then it is used to try to
> resolve an unspecified ..."
> to
> "If INHERIT is a face or a list of faces, then it is used to try to
> resolve a value that is still unspecified after considering the
> `:inherit' attribute."

I made a slightly different change (on the release branch), thanks.

> 2) There are two more instances of `face-background' in
> `pulse-reset-face' in the same file, one with a 't' INHERIT argument.  I
> haven't tried to understand the details, but I strongly suspect they
> should get the 'default' argument as well.

I didn't see any places where a nil value could make a problem, so I
didn't change anything here.  If you see any problems, please report