commit 8f3c3c6cd044e3b5bf08dbfa3b3f04bb3f711bad
author Bram Moolenaar <Bram@vim.org> Tue Oct 18 17:05:54 2022 +0100
committer Bram Moolenaar <Bram@vim.org> Tue Oct 18 17:05:54 2022 +0100
tree 66e5f78b1f4d346156a3fdc958c14fbd3b614f7b
parent 61c4b04799bf114cadc3bbf212ae8b2ad22a6980

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

diff --git a/src/buffer.c b/src/buffer.c
index 0849b70..5a4825f 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -1351,6 +1351,13 @@
     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;