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.
diff --git a/src/if_py_both.h b/src/if_py_both.h
index d6cb13b..0cde18d 100644
--- a/src/if_py_both.h
+++ b/src/if_py_both.h
@@ -5283,8 +5283,11 @@
 	VimTryStart();
 	// Using aucmd_*: autocommands will be executed by rename_buffer
 	aucmd_prepbuf(&aco, self->buf);
-	ren_ret = rename_buffer(val);
-	aucmd_restbuf(&aco);
+	if (curbuf == self->buf)
+	{
+	    ren_ret = rename_buffer(val);
+	    aucmd_restbuf(&aco);
+	}
 	Py_XDECREF(todecref);
 	if (VimTryEnd())
 	    return -1;