Fix #912 - Close lists automatically when g:ale_open_list is set to 'on_save' again

autoload/ale/list.vim

@@ -123,13 +123,19 @@ function! s:SetListsImpl(timer_id, buffer, loclist) abort
     " If ALE isn't currently checking for more problems, close the window if
     " needed now. This check happens inside of this timer function, so
     " the window can be closed reliably.
-    if !ale#engine#IsCheckingBuffer(bufnr(''))
+    if !ale#engine#IsCheckingBuffer(a:buffer)
         call s:CloseWindowIfNeeded(a:buffer)
     endif
 endfunction
 
 function! ale#list#SetLists(buffer, loclist) abort
     if get(g:, 'ale_set_lists_synchronously') == 1
+    \|| getbufvar(a:buffer, 'ale_save_event_fired', 0)
+        " Update lists immediately if running a test synchronously, or if the
+        " buffer was saved.
+        "
+        " The lists need to be updated immediately when saving a buffer so
+        " that we can reliably close window automatically, if so configured.
         call s:SetListsImpl(-1, a:buffer, a:loclist)
     else
         call ale#util#StartPartialTimer(

test/test_list_opening.vader

@@ -189,12 +189,19 @@ Execute(The ale_open_list='on_save' option should work):
   " The list shouldn't open yet, the event wasn't fired.
   Assert !ale#list#IsQuickfixOpen()
 
+  " Turn this option off, to ensure that we update lists immediately when we
+  " save buffers.
+  let g:ale_set_lists_synchronously = 0
   let b:ale_save_event_fired = 1
 
   call ale#list#SetLists(bufnr('%'), g:loclist)
   " Now the list should have opened.
   Assert ale#list#IsQuickfixOpen()
 
+  call ale#list#SetLists(bufnr('%'), [])
+  " The window should close again when the loclist is empty.
+  Assert !ale#list#IsQuickfixOpen()
+
 Execute(The window shouldn't open on save when ale_open_list=0):
   let b:ale_open_list = 0
   let b:ale_save_event_fired = 1