From 3203fb1c5fcfa8e1b3c4e4e802c18241bdbc4272 Mon Sep 17 00:00:00 2001
From: Richard Heck <rgheck@lyx.org>
Date: Mon, 18 Jul 2016 13:01:42 -0400
Subject: [PATCH] Do not crash is release mode if we stumble across an
 unrealized font.

---
 src/frontends/qt4/GuiFontLoader.cpp | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/src/frontends/qt4/GuiFontLoader.cpp b/src/frontends/qt4/GuiFontLoader.cpp
index 9a662a893b..148677b5fb 100644
--- a/src/frontends/qt4/GuiFontLoader.cpp
+++ b/src/frontends/qt4/GuiFontLoader.cpp
@@ -95,11 +95,24 @@ static GuiFontInfo * fontinfo_[NUM_FAMILIES][NUM_SERIES][NUM_SHAPE][NUM_SIZE];
 // if not cached, create it.
 GuiFontInfo & fontinfo(FontInfo const & f)
 {
-	// LASSERT: Is there anything we might do here besides crash?
-	LBUFERR(f.family() < NUM_FAMILIES);
-	LBUFERR(f.series() < NUM_SERIES);
-	LBUFERR(f.realShape() < NUM_SHAPE);
-	LBUFERR(f.size() < NUM_SIZE);
+    bool const fontIsRealized =
+            (f.family() < NUM_FAMILIES) &&
+            (f.series() < NUM_SERIES) &&
+            (f.realShape() < NUM_SHAPE) &&
+            (f.size() < NUM_SIZE);
+    if (!fontIsRealized) {
+        // We can reset the font to something sensible in release mode.
+        LATTEST(false);
+        LYXERR0("Unrealized font!");
+        // We could be fancier here, if we wanted, and just fix things where
+        // there is a problem. But it doesn't seem worth it, since we should
+        // not be here in the first place.
+        GuiFontInfo * & fi =
+            fontinfo_[sane_font.family()][sane_font.series()][sane_font.realShape()][sane_font.size()];
+        if (!fi)
+            fi = new GuiFontInfo(f);
+        return *fi;
+    }
 	// fi is a reference to the pointer type (GuiFontInfo *) in the
 	// fontinfo_ table.
 	GuiFontInfo * & fi =
-- 
2.39.2