我想使用<C-Q>而不是<C-W>向vim内部打开的终端发送密钥。当我在vim内运行命令:set termwinkey=<C-Q>时，我得到错误信息E518: Unknown option: termwinkey=<C-q>。我可以打开vim内部的终端。那么为什么vim不能识别这个选项呢?
[EDIT]:version按要求输出
VIM - Vi IMproved 8.0 (2016 Sep 12, compiled Oct 13 2020 15:49:09)
Included patches: 1-1453
Modified by pkg-vim-maintainers@lists.alioth.debian.org
Compiled by pkg-vim-maintainers@lists.alioth.debian.org
Huge version with GTK2 GUI. Features included (+) or not (-):
+acl +clientserver +dialog_con_gui +find_in_path +keymap +modify_fname +multi_byte +profile +statusline +textobjects +wildignore
+arabic +clipboard +diff +float +lambda +mouse +multi_lang -python -sun_workshop +timers +wildmenu
+autocmd +cmdline_compl +digraphs +folding +langmap +mouseshape -mzscheme +python3 +syntax +title +windows
-autoservername +cmdline_hist +dnd -footer +libcall +mouse_dec +netbeans_intg +quickfix +tag_binary +toolbar +writebackup
+balloon_eval +cmdline_info -ebcdic +fork() +linebreak +mouse_gpm +num64 +reltime +tag_old_static +user_commands +X11
+balloon_eval_term +comments +emacs_tags +gettext +lispindent -mouse_jsbterm +packages +rightleft -tag_any_white +vertsplit -xfontset
+browse +conceal +eval -hangul_input +listcmds +mouse_netterm +path_extra +ruby +tcl +virtualedit +xim
++builtin_terms +cryptv +ex_extra +iconv +localmap +mouse_sgr +perl +scrollbind +termguicolors +visual +xpm
+byte_offset +cscope +extra_search +insert_expand +lua -mouse_sysmouse +persistent_undo +signs +terminal +visualextra +xsmp_interact
+channel +cursorbind +farsi +job +menu +mouse_urxvt +postscript +smartindent +terminfo +viminfo +xterm_clipboard
+cindent +cursorshape +file_in_path +jumplist +mksession +mouse_xterm +printer +startuptime +termresponse +vreplace -xterm_save
system vimrc file: "$VIM/vimrc"
user vimrc file: "$HOME/.vimrc"
2nd user vimrc file: "~/.vim/vimrc"
user exrc file: "$HOME/.exrc"
system gvimrc file: "$VIM/gvimrc"
user gvimrc file: "$HOME/.gvimrc"
2nd user gvimrc file: "~/.vim/gvimrc"
defaults file: "$VIMRUNTIME/defaults.vim"
system menu file: "$VIMRUNTIME/menu.vim"
fall-back for $VIM: "/usr/share/vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_GTK -pthread -I/usr/include/gtk-2.0 -I/usr/lib/x86_64-linux-gnu/gtk-2.0/include -I/usr/include/gio-unix-2.0/ -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/pango-1.0 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/freetype2 -I/usr/include/libpng16 -Wdate-time -g -O2 -fdebug-prefix-map=/build/vim-EfP9JP/vim-8.0.1453=. -fstack-protector-strong -Wformat -Werror=format-security -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: gcc -L. -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -fstack-protector -rdynamic -Wl,-export-dynamic -Wl,-E -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -o vim -lgtk-x11-2.0 -lgdk-x11-2.0 -lpangocairo-1.0 -latk-1.0 -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lpangoft2-1.0 -lpango-1.0 -lgobject-2.0 -lglib-2.0 -lfontconfig -lfreetype -lSM -lICE -lXpm -lXt -lX11 -lXdmcp -lSM -lICE -lm -ltinfo -lnsl -lselinux -lacl -lattr -lgpm -ldl -L/usr/lib -llua5.2 -Wl,-E -fstack-protector-strong -L/usr/local/lib -L/usr/lib/x86_64-linux-gnu/perl/5.26/CORE -lperl -ldl -lm -lpthread -lcrypt -L/usr/lib/python3.6/config-3.6m-x86_64-linux-gnu -lpython3.6m -lpthread -ldl -lutil -lm -L/usr/lib/x86_64-linux-gnu -ltcl8.6 -ldl -lz -lpthread -lm -lruby-2.5 -lpthread -lgmp -ldl -lcrypt -lm
必须将Vim更新到v8.1或更高版本。