Hello,

In documentation about insert mode (':he insert.txt') there is a following 
example:

---------------------------------------------
An example for using CTRL-G u:

          :inoremap <C-H> <C-G>u<C-H>

This redefines the backspace key to start a new undo sequence.  You can now
undo the effect of the backspace key, without changing what you typed before
that, with CTRL-O u.

---------------------------------------------
 
When I tested this example, I didn't get the expected behaviour - the result 
was as though backspace wasn't redefined. The example started working only 
when I defined the mapping as follows:

':inoremap <BS> <C-G>u<BS>'

Also, according to the documentation (':he keycodes'), I expected that 
typing ':<ctrl-k><ctrl-h>' will result in string '<BS>' written on the 
command line, similarly to ':<ctrl-k><ctrl-@>', which results in string 
'<Nul>' written on the command line (I should note that in the last case 
most of the keys don't work as I expected, for example ':<ctrl-k><ctrl-[>' 
doesn't write the string '<Esc>' etc.).
 
I see that <ctrl-h> is equivalent to backspace in the sense that in insert 
mode <ctrl-h> deletes character before the cursor, similarly to the 
backspace.
 

Why in the cases above I don't get the expected behaviour?

 
Thanks.

 

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