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4f66cbbfe5
Allow the value of 'header-line-format' to indicate that no header line should be displayed when it trivially yields 'nil', even if it is not plain 'nil'. Previously, any non-nil 'header-line-format' resulted in a (possibly empty) header line. This change adds some flexibility by also taking a non-nil value of 'header-line-format' to mean that no header line should be displayed if it's a list whose 'car' is a symbol and either that symbol is ':eval' and the second list element evaluates to 'nil', or the symbol's value as a variable is 'nil' or void. (Bug#63825) * src/xdisp.c (safe_eval_inhibit_quit): New function. * src/lisp.h (safe_eval_inhibit_quit): Declare it. * src/window.c (null_header_line_format): New function. (window_wants_header_line): Use it. * doc/lispref/modes.texi (Header Line): Update to reflect new conditions for displaying a window's header line. * etc/NEWS: Announce updated treatment of 'header-line-format'. |
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This directory contains the architecture-independent files used by or with Emacs. This includes some text files of documentation for GNU Emacs or of interest to Emacs users, and the file of dumped docstrings for Emacs functions and variables. COPYRIGHT AND LICENSE INFORMATION FOR IMAGE FILES File: emacs.icon Author: Sun Microsystems, Inc Copyright (C) 1999, 2001-2023 Free Software Foundation, Inc. License: GNU General Public License version 3 or later (see COPYING)