Add missing signal/slot connection, for limiting labels drawn

Author: dakcarto

src/app/qgslabelinggui.cpp

@@ -92,6 +92,7 @@ QgsLabelingGui::QgsLabelingGui( QgsPalLabeling* lbl, QgsVectorLayer* layer, QgsM
   connect( mShadowOffsetAngleSpnBx, SIGNAL( valueChanged( int ) ), mShadowOffsetAngleDial, SLOT( setValue( int ) ) );
   connect( mShadowTranspSlider, SIGNAL( valueChanged( int ) ), mShadowTranspSpnBx, SLOT( setValue( int ) ) );
   connect( mShadowTranspSpnBx, SIGNAL( valueChanged( int ) ), mShadowTranspSlider, SLOT( setValue( int ) ) );
+  connect( mLimitLabelChkBox, SIGNAL( toggled( bool ) ), mLimitLabelSpinBox, SLOT( setEnabled( bool ) ) );
 
   connect( btnEngineSettings, SIGNAL( clicked() ), this, SLOT( showEngineConfigDialog() ) );
   connect( btnExpression, SIGNAL( clicked() ), this, SLOT( showExpressionDialog() ) );