[LyX/master] Make *-lyxformat-* backup files use .lyx~ extension

[Jean-Marc Lasgouttes]

commit d12ebb00b9050503872d81ea33d7804160aa2cd4
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Fri Sep 9 10:37:42 2016 +0200

    Make *-lyxformat-* backup files use .lyx~ extension
    
    At least now that look like real backup files
---
 src/Buffer.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/Buffer.cpp b/src/Buffer.cpp
index 77ef949..e04c06b 100644
--- a/src/Buffer.cpp
+++ b/src/Buffer.cpp
@@ -1322,7 +1322,7 @@ Buffer::ReadStatus Buffer::convertLyXFormat(FileName 
const & fn,
 FileName Buffer::getBackupName() const {
        FileName const & fn = fileName();
        string const fname = fn.onlyFileNameWithoutExt();
-       string const fext  = fn.extension();
+       string const fext  = fn.extension() + "~";
        string const fpath = lyxrc.backupdir_path.empty() ?
                fn.onlyPath().absFileName() :
                lyxrc.backupdir_path;