The gchar_cursor() == NUL check is already done in ins_ctrl_o.
ins_esc changes gchar_cursor() so this if block is probably never
entered.
Issue:
Pressing CTRL-O in insert mode at the end of the line and typing
:startinsert moves the cursor 1 column back, when I expect the cursor
to remain at the end of the line
This is a regression from Vim behavior. Since at least Vim version 7.0,
Vim returns you to insert mode at the end of the line.
091e7d033c is the first bad neovim commit
Steps to reproduce using `nvim -u NORC`:
`aaaa<C-o>:startinsert<CR>`
Fixes#6962
69e9cda5ac