vim-patch:9.0.1538: :wqall does not trigger ExitPre (#23574)

Problem:    :wqall does not trigger ExitPre. (Bart Libert)
Solution:   Move preparations for :qall to a common function. (closes vim/vim#12374)

411da64e77

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/ex_cmds.c

@@ -1926,6 +1926,9 @@ void do_wqall(exarg_T *eap)
   int save_forceit = eap->forceit;
 
   if (eap->cmdidx == CMD_xall || eap->cmdidx == CMD_wqall) {
+    if (before_quit_all(eap) == FAIL) {
+      return;
+    }
     exiting = true;
   }