[LyX/master] Realize inset argument label font before using it

[Jean-Marc Lasgouttes]

commit e35110eab7a540deaf8dc52483f1e5a55a773f46
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Tue Jul 19 22:29:57 2016 +0200

    Realize inset argument label font before using it
---
 src/insets/InsetCollapsable.cpp |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/src/insets/InsetCollapsable.cpp b/src/insets/InsetCollapsable.cpp
index 520d902..668a918 100644
--- a/src/insets/InsetCollapsable.cpp
+++ b/src/insets/InsetCollapsable.cpp
@@ -244,6 +244,7 @@ void InsetCollapsable::draw(PainterInfo & pi, int x, int y) 
const
 
                FontInfo labelfont = getLabelfont();
                labelfont.setColor(labelColor());
+               labelfont.realize(pi.base.font);
                pi.pain.buttonText(x, y, buttonLabel(bv), labelfont,
                                   view_[&bv].mouse_hover_);
                // Draw the change tracking cue on the label, unless RowPainter 
already