Gui: add method isEnabledDecimalPointConversion() to Translator

and use it in DlgGeneralImp::setDecimalPointConversion to fix annoying warning in debug builds

src/Gui/DlgGeneralImp.cpp

@@ -167,8 +167,11 @@ void DlgGeneralImp::setNumberLocale(bool force/* = false*/)
     localeIndex = localeFormat;
 }
 
-void DlgGeneralImp::setDecimalPointConversion(bool on) {
-    Translator::instance()->enableDecimalPointConversion(on);
+void DlgGeneralImp::setDecimalPointConversion(bool on)
+{
+    if (Translator::instance()->isEnabledDecimalPointConversion() != on) {
+        Translator::instance()->enableDecimalPointConversion(on);
+    }
 }
 
 void DlgGeneralImp::saveSettings()

src/Gui/Language/Translator.cpp

@@ -415,4 +415,9 @@ void Translator::enableDecimalPointConversion(bool on)
     }
 }
 
+bool Translator::isEnabledDecimalPointConversion() const
+{
+    return static_cast<bool>(decimalPointConverter);
+}
+
 #include "moc_Translator.cpp"

src/Gui/Language/Translator.h

@@ -80,6 +80,8 @@ public:
     bool eventFilter(QObject* obj, QEvent* ev);
     /** Enables/disables decimal separator conversion **/
     void enableDecimalPointConversion(bool on);
+    /** Returns whether decimal separator conversion is enabled */
+    bool isEnabledDecimalPointConversion() const;
 
 private:
     Translator();