[LyX/master] Properly reset lineno_opts

[Juergen Spitzmueller]

commit 18ebcab4035c3adc9ae15132b7ffc674f734238e
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Mon Jun 3 14:33:08 2019 +0200

    Properly reset lineno_opts
---
 src/Buffer.cpp |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/src/Buffer.cpp b/src/Buffer.cpp
index 3b95440..c995f82 100644
--- a/src/Buffer.cpp
+++ b/src/Buffer.cpp
@@ -943,6 +943,7 @@ int Buffer::readHeader(Lexer & lex)
        params().biblatex_bibstyle.erase();
        params().biblatex_citestyle.erase();
        params().multibib.erase();
+       params().lineno_opts.clear();
 
        for (int i = 0; i < 4; ++i) {
                params().user_defined_bullet(i) = ITEMIZE_DEFAULTS[i];