[zsh bug report] vi-change-whole-line does not kill whole line in some cases

[zsh bug report] vi-change-whole-line does not kill whole line in some cases

[Kuba]

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Hi,
I believe I found a bug in `vi-change-whole-line`.

Minimal zshrc allowing to reproduce the issue:
```
bindkey -v
```

## Steps to reproduce:
1. type 2 words, for example `word1 word2`
2. enter vicmd mode and move cursor to the beginning of first word (`esc`
`0`)
3. use `vi-change` to change word then go back to vicmd (`c` `w` `esc`)
4. use `vi-change-whole-line`

## Expected result:
Kill the current line and enter insert mode.

## Actual result:
The line is killed but the cursor is positioned one place to the right
making the line not empty (line contains single space)

I attach gif recording presenting the issue.
zsh version: 5.6.2 (x86_64-debian-linux-gnu)

All the best,
Kuba

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Re: [zsh bug report] vi-change-whole-line does not kill whole line in some cases

[Jun T]

> 2018/12/03 3:15、Kuba <lxkuba@wp.pl>のメール:
> 
> ## Expected result:
> Kill the current line and enter insert mode.
> 
> ## Actual result:
> The line is killed but the cursor is positioned one place to the right making the line not empty (line contains single space)

I think this is intensional.
Blanks at the start of lines are retained to keep the indentation;
this is the behavior compatible with vim editor with autoindent ON.
If you want a behavior of pure vi (or vim with autoindent OFF),
you may try

bindkey -a -s S cc