From 60cf37471dbcbb36b0d7f9ec8a6994350ba22424 Mon Sep 17 00:00:00 2001
From: Abdelrazak Younes <younes@lyx.org>
Date: Wed, 8 Nov 2006 11:32:33 +0000
Subject: [PATCH] Fix potential crash. Passing an empty string happens _very_
 often.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@15803 a592a061-630c-0410-9148-cb99ea01b6c8
---
 src/frontends/qt4/GuiFontMetrics.C | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/frontends/qt4/GuiFontMetrics.C b/src/frontends/qt4/GuiFontMetrics.C
index 0a1138bfb5..d1ed0ecea8 100644
--- a/src/frontends/qt4/GuiFontMetrics.C
+++ b/src/frontends/qt4/GuiFontMetrics.C
@@ -148,6 +148,9 @@ int GuiFontMetrics::width(QString const & ucs2) const
 
 int GuiFontMetrics::signedWidth(docstring const & s) const
 {
+	if (s.empty())
+		return 0;
+
 	if (s[0] == '-')
 		return -width(&(s[1]), s.length() - 1);
 	else