Fix slider and dial widgets never emit their valueChanged(QVariant)

signals. Fixes use of dial/slider with multiedit form mode.

src/gui/editorwidgets/qgsrangewidgetwrapper.cpp

@@ -169,7 +169,7 @@ void QgsRangeWidgetWrapper::initWidget( QWidget* editor )
         mQgsDial->setSingleStep( step );
     }
 
-    connect( editor, SIGNAL( valueChanged( QVariant ) ), this, SLOT( valueChanged( QVariant ) ) );
+    connect( editor, SIGNAL( valueChanged( QVariant ) ), this, SLOT( valueChangedVariant( QVariant ) ) );
   }
   else if ( mDial )
   {
@@ -198,7 +198,7 @@ bool QgsRangeWidgetWrapper::valid() const
   return mSlider || mDial || mQgsDial || mQgsSlider || mIntSpinBox || mDoubleSpinBox;
 }
 
-void QgsRangeWidgetWrapper::valueChanged( const QVariant& v )
+void QgsRangeWidgetWrapper::valueChangedVariant( const QVariant& v )
 {
   if ( v.type() == QVariant::Int )
     valueChanged( v.toInt() );

src/gui/editorwidgets/qgsrangewidgetwrapper.h

@@ -55,8 +55,11 @@ class GUI_EXPORT QgsRangeWidgetWrapper : public QgsEditorWidgetWrapper
   public slots:
     virtual void setValue( const QVariant& value ) override;
 
-  public slots:
-    void valueChanged( const QVariant& );
+  private slots:
+
+    // NOTE - cannot be named "valueChanged", otherwise implicit conversion to QVariant results in
+    // infinite recursion
+    void valueChangedVariant( const QVariant& );
 
   private:
     QSpinBox* mIntSpinBox;

src/gui/qgsdial.cpp

@@ -113,24 +113,20 @@ void QgsDial::valueChanged( int value )
   if ( mMin.isNull() || mMax.isNull() || mStep.isNull() )
   {
     mValue = QVariant();
-    return;
   }
-
-  if ( mMin.type() == QVariant::Int &&
-       mMax.type() == QVariant::Int &&
-       mStep.type() == QVariant::Int &&
-       mValue.type() == QVariant::Int )
+  else if ( mMin.type() == QVariant::Int &&
+            mMax.type() == QVariant::Int &&
+            mStep.type() == QVariant::Int &&
+            mValue.type() == QVariant::Int )
   {
     mValue = value;
-    return;
   }
-
-  if ( mMin.type() == QVariant::Double &&
-       mMax.type() == QVariant::Double &&
-       mStep.type() == QVariant::Double &&
-       mValue.type() == QVariant::Double )
+  else if ( mMin.type() == QVariant::Double &&
+            mMax.type() == QVariant::Double &&
+            mStep.type() == QVariant::Double &&
+            mValue.type() == QVariant::Double )
   {
     mValue = QVariant( mMin.toDouble() + value * mStep.toDouble() );
-    return;
   }
+  emit valueChanged( mValue );
 }

src/gui/qgsslider.cpp

@@ -118,24 +118,21 @@ void QgsSlider::valueChanged( int value )
   if ( mMin.isNull() || mMax.isNull() || mStep.isNull() )
   {
     mValue = QVariant();
-    return;
   }
-
-  if ( mMin.type() == QVariant::Int &&
-       mMax.type() == QVariant::Int &&
-       mStep.type() == QVariant::Int &&
-       mValue.type() == QVariant::Int )
+  else if ( mMin.type() == QVariant::Int &&
+            mMax.type() == QVariant::Int &&
+            mStep.type() == QVariant::Int &&
+            mValue.type() == QVariant::Int )
   {
     mValue = value;
-    return;
   }
-
-  if ( mMin.type() == QVariant::Double &&
-       mMax.type() == QVariant::Double &&
-       mStep.type() == QVariant::Double &&
-       mValue.type() == QVariant::Double )
+  else if ( mMin.type() == QVariant::Double &&
+            mMax.type() == QVariant::Double &&
+            mStep.type() == QVariant::Double &&
+            mValue.type() == QVariant::Double )
   {
     mValue = QVariant( mMin.toDouble() + value * mStep.toDouble() );
-    return;
   }
+
+  emit valueChanged( mValue );
 }