When system() or systemlist() is called without :silent from a
statusline expression, autocommand, or timer callback, the terminal
is temporarily set to cooked mode, which re-enables ECHO on the tty.
If a terminal response (e.g. DECRPM for cursor blink mode) arrives
during this window, the tty driver echoes it to the screen, leaving
stray characters that require CTRL-L to remove.
This behavior was intentionally addressed in patch 7.4.427 by
skipping cooked mode when :silent is prepended. However, the
documentation only mentioned this for system() and did not cover
systemlist() at all. The guidance to use :silent in non-interactive
contexts (statusline, autocommands, timers) was also not explicit.
closes#19691
Signed-off-by: Yasuhiro Matsumoto <mattn.jp@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
751b59e539
