On 2015-12-06, Viacheslav Lotsmanov wrote:
> Command I use to start (I redefine HOME for use default vim configs):
> env HOME=/dev/null vim
> 
> :verbose set cp? cpo? bs?
> compatible
> cpoptions=aAbBcCdDeEfFgHiIjJkKlLmMnoOpPqrRsStuvwWxXyZ$!%*-+<>;
> backspace=
> 
> ts?=8
> sts?=0
> sw?=8
> et?=noexpandtab

You are starting Vim without a vimrc file and without the -N
argument.  Therefore it is in 'compatible' mode, as Christian
suspected.  In 'compatible' mode (see ":help 'cp'"), the 'backspace'
option is set to "", the Vi-compatible setting, so you cannot
backspace over the start of indent (see ":help 'bs'").

I don't know why changes don't appear until after you exit insert
mode, but I see that behavior in 'compatible' mode, too.

To fix these issues, start Vim as

    HOME=/dev/null vim -N

Regards,
Gary

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