From 8f3c3c6cd044e3b5bf08dbfa3b3f04bb3f711bad Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Tue, 18 Oct 2022 17:05:54 +0100
Subject: patch 9.0.0789: dummy buffer ends up in a window

Problem:    Dummy buffer ends up in a window.
Solution:   Disallow navigating to a dummy buffer.
---
 src/buffer.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src/buffer.c')

diff --git a/src/buffer.c b/src/buffer.c
index 0849b70997..5a4825feb2 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -1351,6 +1351,13 @@ do_buffer_ext(
     if ((flags & DOBUF_NOPOPUP) && bt_popup(buf) && !bt_terminal(buf))
 	return OK;
 #endif
+    if ((action == DOBUF_GOTO || action == DOBUF_SPLIT)
+						  && (buf->b_flags & BF_DUMMY))
+    {
+	// disallow navigating to the dummy buffer
+	semsg(_(e_buffer_nr_does_not_exist), count);
+	return FAIL;
+    }
 
 #ifdef FEAT_GUI
     need_mouse_correct = TRUE;
-- 
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