[LyX/master] Another (IMHO false) fall-through warning silenced

[Juergen Spitzmueller]

commit b73879691f816b0874d9dec0c09e2db7889c4e8e
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Sat Aug 12 08:59:26 2017 +0200

    Another (IMHO false) fall-through warning silenced
    
    With a FIXME. The case should be checked.
---
 src/frontends/qt4/GuiApplication.cpp |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/src/frontends/qt4/GuiApplication.cpp 
b/src/frontends/qt4/GuiApplication.cpp
index b21d86e..1e84746 100644
--- a/src/frontends/qt4/GuiApplication.cpp
+++ b/src/frontends/qt4/GuiApplication.cpp
@@ -2723,7 +2723,8 @@ bool GuiApplication::notify(QObject * receiver, QEvent * 
event)
 #endif
                        // In release mode, try to exit gracefully.
                        this->exit(1);
-
+                       // FIXME: GCC 7 thinks we can fall through here. Can we?
+                       // fall through
                case BufferException: {
                        if (!current_view_ || 
!current_view_->documentBufferView())
                                return false;