GNU bug report logs - #24176
Confusing interaction between define-derived-mode and font-lock-add-keywords

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Package: emacs;

Reported by: Clément Pit--Claudel <clement.pitclaudel <at> live.com>

Date: Sun, 7 Aug 2016 06:42:01 UTC

Severity: minor

Tags: confirmed

Found in version 25.1

Fixed in version 29.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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From: Clément Pit--Claudel <clement.pitclaudel <at> live.com>
To: 24176 <at> debbugs.gnu.org
Subject: bug#24176: Acknowledgement (Confusing interaction between define-derived-mode and font-lock-add-keywords)
Date: Sun, 7 Aug 2016 02:57:19 -0400

[Message part 1 (text/plain, inline)]
Sorry, the original report had a confusing example; here is a fixed copy.

(define-derived-mode ~/a fundamental-mode "~/a"
  (font-lock-add-keywords nil `(("a" 0 'font-lock-keyword-face))))
(define-derived-mode ~/b ~/a "~/b"
  (font-lock-add-keywords nil `(("b" 0 'font-lock-builtin-face))))
(define-derived-mode ~/c ~/b "~/c"
  (font-lock-add-keywords nil `(("c" 0 'font-lock-constant-face))))

Explicitly calling (setq font-lock-major-mode major-mode) before calling font-lock-add-keywords yields the expected behaviour.

Clément.


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This bug report was last modified 3 years and 121 days ago.

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