On 23-Apr-2014 16:28 +0200, Bram Moolenaar wrote:

> Ingo Karkat wrote:
> 
>> I've noticed a regression:
>>
>>     :s/.*/\="foo\nbar"/
>>
>> This correctly replaces the current line with two lines containing "foo"
>> and "bar", respectively. Now add the confirm flag, and accept the
>> replacement:
>>
>>     :s/.*/\="foo\nbar"/c
>>
>> This replaces the current line with a single line containing "foo^@bar"
>> (where ^@ is <Nul>). This is inconsistent and unexpected. Replacing with
>> \r instead works (with and without the flag), and can be used as a
>> workaround.
>>
>> Using the attached scriptlet, I've bisected this to the following patch:
>>
>> ,----[ bad change ]----
>> | 7.3.225  "\n" in a substitute() inside ":s" not handled correctly
>> `----
>>
>> The problem therefore can be seen in this and all following Vim
>> versions, verified up to the latest 7.4.258. (I've used a HUGE build on
>> both Windows/x64 and Linux/x64.)
> 
> I cannot reproduce this problem.

Ah, sorry, I missed one crucial detail of my environment (and forgot to
use -N -u NONE). In my 'statusline', I have a custom function that
performs a =~ comparison. Define the following:

    function! TitleString()
        let check = 'foo' =~ 'bar'
        return ""
    endfunction
    set titlestring=%{TitleString()}

Then, the

    :s/.*/\="foo\nbar"/c

command will produce the ^@. So the =~ (probably triggered while the
confirm flag is in action) somehow affects the behavior of :substitute.

Attached is an updated scriptlet.

-- regards, ingo

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