if &diff only true in first file ?

Hi,

In my .vimrc I have

if &diff
let b:mckgitstatus = "diff"
else
autocmd BufReadPost,BufNewFile,FileReadPost * call MyGitStatus()
autocmd BufUnload * call MyGitLeave()
endif

And in the first file window I do see "diff" status as expected.
But the second file window does not have the "diff" status, but my git stuff.

Any idea why if &diff does not work for the second file window ?

thx always for vim and your support,
-mark

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