vim-patch:7.4.1837 (#5834)

Problem:    The BufUnload event is triggered twice, when :bunload is used with
             set to  or .
Solution:   Do not trigger the event when ml_mfp is NULL. (Hirohito Higashi)

c67e892134

src/nvim/buffer.c

@@ -509,9 +509,12 @@ void buf_freeall(buf_T *buf, int flags)
 
   // Make sure the buffer isn't closed by autocommands.
   buf->b_closing = true;
-  apply_autocmds(EVENT_BUFUNLOAD, buf->b_fname, buf->b_fname, FALSE, buf);
-  if (!buf_valid(buf))              /* autocommands may delete the buffer */
+  if (buf->b_ml.ml_mfp != NULL) {
+      apply_autocmds(EVENT_BUFUNLOAD, buf->b_fname, buf->b_fname, false, buf);
+      if (!buf_valid(buf)) {    // autocommands may delete the buffer
           return;
+      }
+  }
   if ((flags & BFA_DEL) && buf->b_p_bl) {
     apply_autocmds(EVENT_BUFDELETE, buf->b_fname, buf->b_fname, FALSE, buf);
     if (!buf_valid(buf))            /* autocommands may delete the buffer */

src/nvim/testdir/test_autocmd.vim

@@ -7,10 +7,7 @@ func Test_vim_did_enter()
   " becomes one.
 endfunc
 
-if !has('timers')
-  finish
-endif
-
+if has('timers')
   func ExitInsertMode(id)
     call feedkeys("\<Esc>")
   endfunc
@@ -33,3 +30,33 @@ func Test_cursorhold_insert_ctrl_x()
     call feedkeys("a\<C-X>", 'x!')
     call assert_equal(0, g:triggered)
   endfunc
+endif
+
+function Test_bufunload()
+  augroup test_bufunload_group
+    autocmd!
+    autocmd BufUnload * call add(s:li, "bufunload")
+    autocmd BufDelete * call add(s:li, "bufdelete")
+    autocmd BufWipeout * call add(s:li, "bufwipeout")
+  augroup END
+
+  let s:li=[]
+  new
+  setlocal bufhidden=
+  bunload
+  call assert_equal(["bufunload", "bufdelete"], s:li)
+
+  let s:li=[]
+  new
+  setlocal bufhidden=delete
+  bunload
+  call assert_equal(["bufunload", "bufdelete"], s:li)
+
+  let s:li=[]
+  new
+  setlocal bufhidden=unload
+  bwipeout
+  call assert_equal(["bufunload", "bufdelete", "bufwipeout"], s:li)
+
+  augroup! test_bufunload_group
+endfunc

src/nvim/version.c

@@ -603,7 +603,7 @@ static int included_patches[] = {
   1840,
   // 1839,
   // 1838,
-  // 1837,
+  1837,
   1836,
   1835,
   1833,