The attached trivial patch fixes
http://bugzilla.lyx.org/show_bug.cgi?id=3345

There's no need for a fracClicked handling, as for the other similar buttons.
OK to go in?

regards Uwe
Index: QMathDialog.C
===================================================================
--- QMathDialog.C	(revision 17464)
+++ QMathDialog.C	(working copy)
@@ -63,7 +63,6 @@
 
 	connect( tearoffPB, SIGNAL( clicked() ), this, SLOT( expandClicked() ) );
 	connect( closePB, SIGNAL( clicked() ), this, SLOT( accept() ) );
-	connect( fracPB, SIGNAL( clicked() ), this, SLOT( fracClicked() ) );
 	connect( superscriptPB, SIGNAL( clicked() ), this, SLOT( superscriptClicked() ) );
 	connect( subscriptPB, SIGNAL( clicked() ), this, SLOT( subscriptClicked() ) );
 	connect( delimitersPB, SIGNAL( clicked() ), this, SLOT( delimiterClicked() ) );
@@ -202,12 +201,6 @@
 }
 
 
-void QMathDialog::fracClicked()
-{
-	form_->controller().dispatchInsert("frac");
-}
-
-
 void QMathDialog::delimiterClicked()
 {
 	form_->controller().showDialog("mathdelimiter");
Index: QMathDialog.h
===================================================================
--- QMathDialog.h	(revision 17464)
+++ QMathDialog.h	(working copy)
@@ -53,7 +53,6 @@
 public Q_SLOTS:
 	virtual void delimiterClicked();
 	virtual void expandClicked();
-	virtual void fracClicked();
 	virtual void functionSelected(QListWidgetItem *);
 	virtual void matrixClicked();
 	virtual void subscriptClicked();

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