The --enable-wgetch-events codepath is experimental (according to
ncurses-6.2/INSTALL) and off by default (according to
ncurses-6.2/configure.in). With that codepath disabled, the macro
KEY_EVENT is not provided, which (before this commit) manifested as a
build-time error:
[ 245s] gcc -c -I. -I../../Src -I../../Src -I../../Src/Zle -I. -DHAVE_CONFIG_H -DMODULE -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -Werror=return-type -flto=auto -g -fPIE -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=600 -I/usr/include/ncursesw -fPIC -o curses..o curses.c
[ 246s] In file included from curses.c:210:
[ 246s] curses_keys.h:93:15: error: 'KEY_EVENT' undeclared here (not in a function); did you mean 'KEY_RESET'?
[ 246s] 93 | {"EVENT", KEY_EVENT},
[ 246s] | ^~~~~~~~~
[ 246s] | KEY_RESET
curses_keys.h is only used for setting the "kevent" output parameter of
'zcurses input' (and the associated $zcurses_keycodes special variable),
so there's no harm in just leaving KEY_EVENT out of it. (That codepath
deals gracefully with numeric values that don't correspond to any of the
known compile-time values, as that can happen whenever the build- and
run-time versions of ncurses don't provide the same set of KEY_* macros,
with or without relation to that configure flag.)
Reported by Martin Liska.
