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I have this lines for my statusline
set statusline=%{&paste?'\ \ paste\ ':''}
set statusline+=\ %{expand('%:~:.')!=#''?expand('%:~:.'):'[No\ Name]'}
set statusline+=%{&readonly?'\ \ [RO]':!&modifiable?'\ \ [RO]':''}
I removed other parts for avoiding useless complexity. As you can see, I need to put two spaces before [RO] in the third/last line when I only get one in output. Why is that?
Edit: My version is NVIM v0.3.0-dev
Inside a %{} the first space character in the expression seems to be always removed. For example, let &statusline="%{' ]'}" displays the string " ]". It also seems to be independent of fillchars. That is, if set fillchars=stl:^, "^]^^^^" will be displayed. Why this happens or if it's intentional is quite mysterious to me (hopefully someone else can answer this question).
A workaround is to use a different space character, e.g., a non breaking space 0xA0:
let &statusline="%{'\ua0xyz'}"
or
set statusline=%{\"\\ua0xyz\"}
