From c6133116ca930902e39c5eb99c14b1624744ab45 Mon Sep 17 00:00:00 2001
From: Gerd Moellmann <gerd@gnu.org>
Date: Tue, 21 Nov 2000 20:39:23 +0000
Subject: [PATCH] (Fkill_buffer): Notice if the buffer to kill is the sole
 visible buffer when we're currently in the mini-buffer, and give up if so.

---
 src/buffer.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/buffer.c b/src/buffer.c
index 8c2deeb5bac..99815cb2d7d 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -1236,6 +1236,17 @@ with SIGHUP.")
 	return Qnil;
     }
 
+  /* Notice if the buffer to kill is the sole visible buffer
+     when we're currently in the mini-buffer, and give up if so.  */
+  XSETBUFFER (tem, current_buffer);
+  if (EQ (tem, XWINDOW (minibuf_window)->buffer))
+    {
+      tem = Fother_buffer (buf, Qnil, Qnil);
+      Fset_buffer (tem);
+      if (EQ (buf, tem))
+	return Qnil;
+    }
+
   /* Now there is no question: we can kill the buffer.  */
 
 #ifdef CLASH_DETECTION
-- 
2.30.2