Fix #665 - Stop prompts appearing when fixing files on save

autoload/ale/fix.vim

@@ -28,6 +28,10 @@ function! ale#fix#ApplyQueuedFixes() abort
     call remove(g:ale_fix_buffer_data, l:buffer)
 
     if l:data.changes_made
+        if l:data.should_save
+             noautocmd :w!
+        endif
+
         call setline(1, l:data.output)
 
         let l:start_line = len(l:data.output) + 1
@@ -76,10 +80,6 @@ function! ale#fix#ApplyFixes(buffer, output) abort
         let l:data.done = 1
     endif
 
-    if l:data.changes_made && l:data.should_save
-        call writefile(a:output, l:data.filename)
-    endif
-
     if !bufexists(a:buffer)
         " Remove the buffer data when it doesn't exist.
         call remove(g:ale_fix_buffer_data, a:buffer)