[LyX/master] Initialize member

[Jean-Marc Lasgouttes]

commit c521e3e1de960ba3c45c0e83d04d86f5e7c68d58
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Mon Feb 18 15:10:05 2019 +0100

    Initialize member
    
    Spotted by coverity
---
 src/insets/InsetLayout.cpp |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/src/insets/InsetLayout.cpp b/src/insets/InsetLayout.cpp
index acef3d1..5d9427d 100644
--- a/src/insets/InsetLayout.cpp
+++ b/src/insets/InsetLayout.cpp
@@ -44,7 +44,8 @@ InsetLayout::InsetLayout() :
        freespacing_(false), keepempty_(false), forceltr_(false),
        forceownlines_(false), needprotect_(false), needcprotect_(false),
        intoc_(false), spellcheck_(true), resetsfont_(false), display_(true),
-       forcelocalfontswitch_(false), add_to_toc_(false), is_toc_caption_(false)
+       forcelocalfontswitch_(false), add_to_toc_(false), 
is_toc_caption_(false),
+       edit_external_(false)
 {
        labelfont_.setColor(Color_error);
 }