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copy-face, delete-frame -> invalid face

From: David Reitter
Subject: copy-face, delete-frame -> invalid face
Date: Sun, 16 Dec 2007 08:53:18 +0000

Executing the following:

(let ((nf (make-frame)))
  (copy-face 'default 'new-face (selected-frame) nf)
  (delete-frame nf)

will produce the error below, and it will render Emacs unusable until a restart, because the faulty new-face persists and causes the problem whenever a new frame is made.

Debugger entered--Lisp error: (error "Invalid face" new-face)
internal-get-lisp-face-attribute(new-face :family #<frame Emacs@scarlett.lan 0x76a710>)
  face-attribute(new-face :family #<frame Emacs@scarlett.lan 0x76a710>)
  face-attr-match-p(new-face nil #<frame Emacs@scarlett.lan 0x76a710>)
  face-spec-match-p(new-face nil #<frame Emacs@scarlett.lan 0x76a710>)
  frame-set-background-mode(#<frame Emacs@scarlett.lan 0x1f102e0>)

In GNU Emacs (i386-apple-darwin8.10.1, Carbon Version 1.6.0)
 of 2007-10-15 on plume.sr.unh.edu
Windowing system distributor `Apple Inc.', version 10.5.1
configured using `configure  '--without-x' '--prefix=/usr/local''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  locale-coding-system: iso-8859-1
  default-enable-multibyte-characters: t

Major mode: Debugger

Minor modes in effect:
  encoded-kbd-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  line-number-mode: t

Recent input:
<down-mouse-1> <drag-mouse-1> C-y C-x C-e <switch-frame>
<help-echo> <help-echo> <down-mouse-1> <mouse-1> <help-echo>
<menu-bar> <help-menu> <send-emacs-bug-report>

Recent messages:
For information about the GNU system and GNU/Linux, type C-h C-p. [2 times]
Loading encoded-kb...done
Mark set
Loading debug...done
Entering debugger...
Loading help-mode...done
Loading emacsbug...
Loading regexp-opt...done
Loading emacsbug...done
call-interactively: Text is read-only

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