vim-patch:8.2.2900: QuitPre is triggered before :wq writes the file

Problem:    QuitPre is triggered before :wq writes the file, which is
            different from other commands.
Solution:   Trigger QuitPre after writing the file. (closes vim/vim#8279)
1174b018a6

src/nvim/ex_docmd.c

@@ -5017,7 +5017,7 @@ char_u *check_nextcmd(char_u *p)
 static int
 check_more(
     int message,                // when FALSE check only, no messages
-    int forceit
+    bool forceit
 )
 {
   int n = ARGCOUNT - curwin->w_arg_idx - 1;
@@ -6340,7 +6340,7 @@ void not_exiting(void)
   exiting = false;
 }
 
-bool before_quit_autocmds(win_T *wp, bool quit_all, int forceit)
+bool before_quit_autocmds(win_T *wp, bool quit_all, bool forceit)
 {
   apply_autocmds(EVENT_QUITPRE, NULL, NULL, false, wp->w_buffer);
 
@@ -6749,7 +6749,7 @@ static void ex_stop(exarg_T *eap)
   apply_autocmds(EVENT_VIMRESUME, NULL, NULL, false, NULL);
 }
 
-// ":exit", ":xit" and ":wq": Write file and quite the current window.
+// ":exit", ":xit" and ":wq": Write file and quit the current window.
 static void ex_exit(exarg_T *eap)
 {
   if (cmdwin_type != 0) {
@@ -6762,17 +6762,15 @@ static void ex_exit(exarg_T *eap)
     return;
   }
 
-  if (before_quit_autocmds(curwin, false, eap->forceit)) {
+  // we plan to exit if there is only one relevant window
-    return;
-  }
-
-  // if more files or windows we won't exit
   if (check_more(false, eap->forceit) == OK && only_one_window()) {
     exiting = true;
   }
-  if (((eap->cmdidx == CMD_wq
+  // Write the buffer for ":wq" or when it was changed.
-        || curbufIsChanged())
+  // Trigger QuitPre and ExitPre.
-       && do_write(eap) == FAIL)
+  // Check if we can exit now, after autocommands have changed things.
+  if (((eap->cmdidx == CMD_wq || curbufIsChanged()) && do_write(eap) == FAIL)
+      || before_quit_autocmds(curwin, false, eap->forceit)
       || check_more(true, eap->forceit) == FAIL
       || (only_one_window() && check_changed_any(eap->forceit, false))) {
     not_exiting();

src/nvim/testdir/test_writefile.vim

@@ -361,4 +361,25 @@ func Test_write_file_encoding()
   %bw!
 endfunc
 
+" Check that buffer is written before triggering QuitPre
+func Test_wq_quitpre_autocommand()
+  edit Xsomefile
+  call setline(1, 'hello')
+  split
+  let g:seq = []
+  augroup Testing
+    au QuitPre * call add(g:seq, 'QuitPre - ' .. (&modified ? 'modified' : 'not modified'))
+    au BufWritePost * call add(g:seq, 'written')
+  augroup END
+  wq
+  call assert_equal(['written', 'QuitPre - not modified'], g:seq)
+
+  augroup Testing
+    au!
+  augroup END
+  bwipe!
+  unlet g:seq
+  call delete('Xsomefile')
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab