Eshel Yaron 4f66cbbfe5 Avoid header line with some empty non-nil formats ... 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'.		2023-06-06 15:08:31 +03:00
..
emacs	Merge from origin/emacs-29	2023-05-26 07:04:03 -04:00
lispintro	; Minor fix in Emacs Lisp Intro manual	2023-04-21 19:16:52 +03:00
lispref	Avoid header line with some empty non-nil formats	2023-06-06 15:08:31 +03:00
man	; Add 2023 to copyright years.	2023-01-01 05:31:12 -05:00
misc	Merge from origin/emacs-29	2023-06-03 05:50:58 -04:00