Apply the math options after dialog be closed

DSView/pv/dialogs/mathoptions.cpp

@@ -174,9 +174,12 @@ void MathOptions::retranslateUi()
 
 void MathOptions::accept()
 {
-	using namespace Qt;
+    using namespace Qt;
     QDialog::accept();
+}
 
+void MathOptions::Apply()
+{
     int src1 = -1;
     int src2 = -1;
     data::MathStack::MathType type = data::MathStack::MATH_ADD;

DSView/pv/dialogs/mathoptions.h

@@ -56,6 +56,8 @@ public:
     MathOptions(SigSession *session, QWidget *parent);
     ~MathOptions();
 
+    void Apply();
+
 private:   
     void retranslateUi();
 

DSView/pv/toolbars/trigbar.cpp

@@ -285,7 +285,10 @@ void TrigBar::on_actionFft_triggered()
 void TrigBar::on_actionMath_triggered()
 {
     pv::dialogs::MathOptions math_dlg(_session, this);
-    math_dlg.exec();
+    if (math_dlg.exec() == QDialog::Accepted)
+    {
+        math_dlg.Apply();
+    }
 }
 
 void TrigBar::on_actionDark_triggered()