According to the :help i_CTRL-O --
> The CTRL-O command takes you to Normal mode. If you then use a command enter
> Insert mode again it doesn't nest. Thus when typing "a<C-O>a" and then <Esc>
> takes you back to Normal mode, you do not need to type <Esc> twice.
There are several commands to enter Insert mode, for example, a, i, S,
cc.
So I think that Insert mode will never be nested even if such commands
are
used after <C-o>. But Vim seems not to behave so. For example:
$ vim -u NONE -N -e -s -c 'execute "normal!" "ifoo\<C-o>abar
\<Esc>Fb" | verbose echo getline(1, "$") line(".") col(".") | qall!'
['foobar'] 1 4
$ vim -u NONE -N -e -s -c 'execute "normal!" "ifoo\<C-o>ccbar
\<Esc>Fb" | verbose echo getline(1, "$") line(".") col(".") | qall!'
['barFb'] 1 5
$ vim -u NONE -N -e -s -c 'execute "normal!" "ifoo\<C-o>Sbar
\<Esc>Fb" | verbose echo getline(1, "$") line(".") col(".") | qall!'
['barFb'] 1 5
<C-o>a works as documented. But both <C-o>cc and <C-o>S don't work as
documented. They behave as if Insert mode is nested.
Furthermode, <C-o>cc and <C-o>S work as documented if they are
interactively
typed by user. The "nested" behavior only happens if <C-o>cc and <C-
o>S are
executed via :normal or :map.
Is this behavior intentional?
I confirmed it with the following :version:
VIM - Vi IMproved 7.3 (2010 Aug 15, compiled Apr 8 2012 11:17:30)
MacOS X (unix) version
Included patches: 1-494
Compiled by kana@avril
Huge version without GUI. Features included (+) or not (-):
+arabic +autocmd -balloon_eval -browse ++builtin_terms +byte_offset
+cindent
-clientserver +clipboard +cmdline_compl +cmdline_hist +cmdline_info
+comments
+conceal +cryptv -cscope +cursorbind +cursorshape +dialog_con +diff
+digraphs
-dnd -ebcdic +emacs_tags +eval +ex_extra +extra_search +farsi
+file_in_path
+find_in_path +float +folding -footer +fork() -gettext -hangul_input
+iconv
+insert_expand +jumplist +keymap +langmap +libcall +linebreak
+lispindent
+listcmds +localmap -lua +menu +mksession +modify_fname +mouse -
mouseshape
+mouse_dec -mouse_gpm -mouse_jsbterm +mouse_netterm -mouse_sysmouse
+mouse_xterm +mouse_urxvt +multi_byte +multi_lang -mzscheme -
netbeans_intg
+path_extra -perl +persistent_undo +postscript +printer +profile -
python
-python3 +quickfix +reltime +rightleft -ruby +scrollbind +signs
+smartindent
-sniff +startuptime +statusline -sun_workshop +syntax +tag_binary
+tag_old_static -tag_any_white -tcl +terminfo +termresponse
+textobjects +title
-toolbar +user_commands +vertsplit +virtualedit +visual +visualextra
+viminfo
+vreplace +wildignore +wildmenu +windows +writebackup -X11 -xfontset -
xim -xsmp
-xterm_clipboard -xterm_save
system vimrc file: "$VIM/vimrc"
user vimrc file: "$HOME/.vimrc"
user exrc file: "$HOME/.exrc"
fall-back for $VIM: "/Users/kana/.vvm/vims/vimorg--v7-3-494/share/
vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -DMACOS_X_UNIX -no-
cpp-precomp -g -O -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: gcc -L/usr/local/lib -o vim -lm -lncurses -liconv -
framework Cocoa
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