vim-patch:9.0.0965: using one window for executing autocommands is insufficient

Problem:    Using one window for executing autocommands is insufficient.
Solution:   Use up to five windows for executing autocommands.

https://github.com/vim/vim/commit/e76062c078debed0df818f70e4db14ad7a7cb53a

N/A patches for version.c:

vim-patch:9.0.0966: some compilers don't allow a declaration after a label

Problem:    Some compilers don't allow a declaration after a label.
Solution:   Move the declaration to the start of the block. (John Marriott)

https://github.com/vim/vim/commit/f86490ed4fdab213a28f667abd055c023a73d645

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

1 files changed, 53 insertions, 43 deletions

diff --git a/src/nvim/quickfix.c b/src/nvim/quickfix.c
index f083b6792b..be6ddede2e 100644
--- a/src/nvim/quickfix.c
+++ b/src/nvim/quickfix.c
@@ -3902,21 +3902,27 @@ static void qf_update_buffer(qf_info_T *qi, qfline_T *old_last)
 
     aco_save_T aco;
 
+    bool do_fill = true;
     if (old_last == NULL) {
       // set curwin/curbuf to buf and save a few things
       aucmd_prepbuf(&aco, buf);
+      if (curbuf != buf) {
+        do_fill = false;  // failed to find a window for "buf"
+      }
     }
 
-    qf_update_win_titlevar(qi);
+    if (do_fill) {
+      qf_update_win_titlevar(qi);
 
-    qf_fill_buffer(qf_get_curlist(qi), buf, old_last, qf_winid);
-    buf_inc_changedtick(buf);
+      qf_fill_buffer(qf_get_curlist(qi), buf, old_last, qf_winid);
+      buf_inc_changedtick(buf);
 
-    if (old_last == NULL) {
-      (void)qf_win_pos_update(qi, 0);
+      if (old_last == NULL) {
+        (void)qf_win_pos_update(qi, 0);
 
-      // restore curwin/curbuf and a few other things
-      aucmd_restbuf(&aco);
+        // restore curwin/curbuf and a few other things
+        aucmd_restbuf(&aco);
+      }
     }
 
     // Only redraw when added lines are visible.  This avoids flickering when
@@ -5463,9 +5469,11 @@ static int vgr_process_files(win_T *wp, qf_info_T *qi, vgr_args_T *cmd_args, boo
           // options!
           aco_save_T aco;
           aucmd_prepbuf(&aco, buf);
-          apply_autocmds(EVENT_FILETYPE, buf->b_p_ft, buf->b_fname, true, buf);
-          do_modelines(OPT_NOWIN);
-          aucmd_restbuf(&aco);
+          if (curbuf == buf) {
+            apply_autocmds(EVENT_FILETYPE, buf->b_p_ft, buf->b_fname, true, buf);
+            do_modelines(OPT_NOWIN);
+            aucmd_restbuf(&aco);
+          }
         }
       }
     }
@@ -5623,41 +5631,43 @@ static buf_T *load_dummy_buffer(char *fname, char *dirname_start, char *resultin
     // set curwin/curbuf to buf and save a few things
     aco_save_T aco;
     aucmd_prepbuf(&aco, newbuf);
-
-    // Need to set the filename for autocommands.
-    (void)setfname(curbuf, fname, NULL, false);
-
-    // Create swap file now to avoid the ATTENTION message.
-    check_need_swap(true);
-
-    // Remove the "dummy" flag, otherwise autocommands may not
-    // work.
-    curbuf->b_flags &= ~BF_DUMMY;
-
-    bufref_T newbuf_to_wipe;
-    newbuf_to_wipe.br_buf = NULL;
-    int readfile_result = readfile(fname, NULL, (linenr_T)0, (linenr_T)0,
-                                   (linenr_T)MAXLNUM, NULL,
-                                   READ_NEW | READ_DUMMY, false);
-    newbuf->b_locked--;
-    if (readfile_result == OK
-        && !got_int
-        && !(curbuf->b_flags & BF_NEW)) {
-      failed = false;
-      if (curbuf != newbuf) {
-        // Bloody autocommands changed the buffer!  Can happen when
-        // using netrw and editing a remote file.  Use the current
-        // buffer instead, delete the dummy one after restoring the
-        // window stuff.
-        set_bufref(&newbuf_to_wipe, newbuf);
-        newbuf = curbuf;
+    if (curbuf == newbuf) {
+      // Need to set the filename for autocommands.
+      (void)setfname(curbuf, fname, NULL, false);
+
+      // Create swap file now to avoid the ATTENTION message.
+      check_need_swap(true);
+
+      // Remove the "dummy" flag, otherwise autocommands may not
+      // work.
+      curbuf->b_flags &= ~BF_DUMMY;
+
+      bufref_T newbuf_to_wipe;
+      newbuf_to_wipe.br_buf = NULL;
+      int readfile_result = readfile(fname, NULL, (linenr_T)0, (linenr_T)0,
+                                     (linenr_T)MAXLNUM, NULL,
+                                     READ_NEW | READ_DUMMY, false);
+      newbuf->b_locked--;
+      if (readfile_result == OK
+          && !got_int
+          && !(curbuf->b_flags & BF_NEW)) {
+        failed = false;
+        if (curbuf != newbuf) {
+          // Bloody autocommands changed the buffer!  Can happen when
+          // using netrw and editing a remote file.  Use the current
+          // buffer instead, delete the dummy one after restoring the
+          // window stuff.
+          set_bufref(&newbuf_to_wipe, newbuf);
+          newbuf = curbuf;
+        }
       }
-    }
 
-    // Restore curwin/curbuf and a few other things.
-    aucmd_restbuf(&aco);
-    if (newbuf_to_wipe.br_buf != NULL && bufref_valid(&newbuf_to_wipe)) {
-      wipe_buffer(newbuf_to_wipe.br_buf, false);
+      // Restore curwin/curbuf and a few other things.
+      aucmd_restbuf(&aco);
+
+      if (newbuf_to_wipe.br_buf != NULL && bufref_valid(&newbuf_to_wipe)) {
+        wipe_buffer(newbuf_to_wipe.br_buf, false);
+      }
     }
 
     // Add back the "dummy" flag, otherwise buflist_findname_file_id()