fix possible crash while opening help

Suggested by Benno Schulenberg (upstream maintainer) at:

http://lists.gnu.org/archive/html/nano-devel/2019-05/msg00027.html

0005-nano-4.2-help-crash.patch

@@ -0,0 +1,30 @@
+From 00351963c03818d058bfc355663fe0d7c86b9386 Mon Sep 17 00:00:00 2001
+From: Benno Schulenberg <bensberg@telfort.nl>
+Date: Thu, 23 May 2019 12:43:31 +0200
+Subject: [PATCH] help: don't check for confinement when opening a temporary
+ help-text file
+
+This fixes https://savannah.gnu.org/bugs/?56369.
+
+Upstream-commit: acd23551c3322f397dc43f97796273a8958f6ef9
+Signed-off-by: Kamil Dudka <kdudka@redhat.com>
+---
+ src/files.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/files.c b/src/files.c
+index 20bbd942..7952bc00 100644
+--- a/src/files.c
++++ b/src/files.c
+@@ -420,7 +420,7 @@ bool open_buffer(const char *filename, bool new_buffer)
+ 	as_an_at = FALSE;
+ 
+ #ifdef ENABLE_OPERATINGDIR
+-	if (outside_of_confinement(filename, FALSE)) {
++	if (!inhelp && outside_of_confinement(filename, FALSE)) {
+ 		statusline(ALERT, _("Can't read file from outside of %s"),
+ 								operating_dir);
+ 		return FALSE;
+-- 
+2.20.1
+

nano.spec

@@ -1,7 +1,7 @@
 Summary:         A small text editor
 Name:            nano
 Version:         4.2
-Release:         1%{?dist}
+Release:         2%{?dist}
 License:         GPLv3+
 URL:             https://www.nano-editor.org
 Source:          https://www.nano-editor.org/dist/latest/%{name}-%{version}.tar.xz
@@ -17,6 +17,9 @@ BuildRequires:   sed
 BuildRequires:   texinfo
 Conflicts:       filesystem < 3
 
+# fix possible crash while opening help
+Patch5:   0005-nano-4.2-help-crash.patch
+
 %description
 GNU nano is a small and friendly text editor.
 
@@ -64,6 +67,9 @@ install -m 0644 ./nanorc %{buildroot}%{_sysconfdir}/nanorc
 %{_datadir}/nano
 
 %changelog
+* Tue May 28 2019 Kamil Dudka <kdudka@redhat.com> - 4.2-2
+- fix possible crash while opening help
+
 * Wed Apr 24 2019 Kamil Dudka <kdudka@redhat.com> - 4.2-1
 - new upstream release