From c3b950483565ca53265a4105a4946585f8b59e24 Mon Sep 17 00:00:00 2001
From: Enrico Forestieri <forenr@lyx.org>
Date: Tue, 19 Feb 2019 19:51:11 +0100
Subject: [PATCH] Fix bug #11490

Correctly add the branch name suffix when the stem
of the filename contains a dot.
---
 src/Buffer.cpp | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/Buffer.cpp b/src/Buffer.cpp
index ff303a7fa0..dc35734f6c 100644
--- a/src/Buffer.cpp
+++ b/src/Buffer.cpp
@@ -812,10 +812,9 @@ FileName Buffer::Impl::exportFileName() const
 	if (branch_suffix.empty())
 		return filename;
 
-	string const name = filename.onlyFileNameWithoutExt()
-		+ to_utf8(branch_suffix);
+	string const name = addExtension(filename.onlyFileNameWithoutExt()
+			+ to_utf8(branch_suffix), filename.extension());
 	FileName res(filename.onlyPath().absFileName() + "/" + name);
-	res.changeExtension(filename.extension());
 
 	return res;
 }
-- 
2.39.5