statusline reset pb

Hi,

I use those func to change statusline but when I want to restore
initial statusline format , it fails.

1/ InitStatusLine

function! InitStatusLine(taskName)

"
let g:savedStatusLine = &statusline
<<<<<<<<<<<<<< save initial status line

"
if &laststatus != 2
set laststatus=2
endif
let s:statusTask = a:taskName
let s:statusXtraInfo = ''

call s:StatusLineTaskUpdate(a:taskName . ' | Progress:')
setlocal statusline=%{DefineStatusLine()}

endfunction

function! s:StatusLineTaskUpdate(msg)
let s:statusTask = a:msg
redrawstatus
endfunction

function! DefineStatusLine()
return s:statusTask. " -- ". s:statusXtraInfo
endfunction

2/

function! RestoreStatusLine()
" call WaitingFunc(1000)
let &statusline = g:savedStatusLine
endfunction

Why my statusline is not reset ?

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