vim-patch:8.1.0877: new buffer used every time the quickfix window is opened

Problem:    New buffer used every time the quickfix window is opened.
Solution:   Reuse the buffer. (Yegappan Lakshmanan, closes vim/vim#3902)
https://github.com/vim/vim/commit/ee8188fc74a7cf9ee7acb634b2bb7a032d0cb24c

1 files changed, 4 insertions, 10 deletions

diff --git a/src/nvim/buffer.c b/src/nvim/buffer.c
index ec633dcc26..0fda66105f 100644
--- a/src/nvim/buffer.c
+++ b/src/nvim/buffer.c
@@ -5397,18 +5397,12 @@ bool buf_hide(const buf_T *const buf)
 char_u *buf_spname(buf_T *buf)
 {
   if (bt_quickfix(buf)) {
-    win_T       *win;
-    tabpage_T   *tp;
-
-    /*
-     * For location list window, w_llist_ref points to the location list.
-     * For quickfix window, w_llist_ref is NULL.
-     */
-    if (find_win_for_buf(buf, &win, &tp) && win->w_llist_ref != NULL) {
-      return (char_u *)_(msg_loclist);
-    } else {
+    // Differentiate between the quickfix and location list buffers using
+    // the buffer number stored in the global quickfix stack.
+    if (buf->b_fnum == qf_stack_get_bufnr()) {
       return (char_u *)_(msg_qflist);
     }
+    return (char_u *)_(msg_loclist);
   }
   // There is no _file_ when 'buftype' is "nofile", b_sfname
   // contains the name as specified by the user.