From f91cd9d25523b77b0599e08709f6678327f86ad3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrgen=20Spitzm=C3=BCller?= <spitz@lyx.org>
Date: Fri, 19 Mar 2010 13:35:32 +0000
Subject: [PATCH] fix bug #6513.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@33800 a592a061-630c-0410-9148-cb99ea01b6c8
---
 src/frontends/qt4/GuiDocument.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/frontends/qt4/GuiDocument.cpp b/src/frontends/qt4/GuiDocument.cpp
index 318c1a297b..dac72fe2ae 100644
--- a/src/frontends/qt4/GuiDocument.cpp
+++ b/src/frontends/qt4/GuiDocument.cpp
@@ -1827,7 +1827,7 @@ void GuiDocument::updateDefaultFormat()
 	if (!bufferview())
 		return;
 	// make a copy in order to consider unapplied changes
-	Buffer * tmpbuf = const_cast<Buffer *>(&buffer());
+	Buffer * tmpbuf = buffer().clone();
 	tmpbuf->params().useXetex = outputModule->xetexCB->isChecked();
 	int idx = latexModule->classCO->currentIndex();
 	if (idx >= 0) {
@@ -1847,6 +1847,8 @@ void GuiDocument::updateDefaultFormat()
 		outputModule->defaultFormatCO->addItem(qt_((*cit)->prettyname()),
 				QVariant(toqstr((*cit)->name())));
 	outputModule->defaultFormatCO->blockSignals(false);
+	// delete the copy
+	delete tmpbuf;
 }