validate math formula on text change

Author: bryanparadis

Software/PC_Application/LibreVNA-GUI/Traces/traceeditdialog.cpp

@@ -147,8 +147,7 @@ TraceEditDialog::TraceEditDialog(Trace &t, QWidget *parent) :
 
     // Math source configuration
     if(t.getModel()) {
-        ui->lMathFormula->setText(t.getMathFormula());
-        connect(ui->lMathFormula, &QLineEdit::editingFinished, [&](){
+        connect(ui->lMathFormula, &QLineEdit::textChanged, [&](){
             t.setMathFormula(ui->lMathFormula->text());
             ui->buttonBox->button(QDialogButtonBox::Ok)->setEnabled(t.mathFormularValid());
         });