fix visibility tracking of tile scale widget

Author: jef-n

src/core/raster/qgsrasteriterator.h

@@ -57,6 +57,7 @@ class CORE_EXPORT QgsRasterIterator
        @param bandNumber band to read
        @param nCols number of columns on output device
        @param nRows number of rows on output device
+       @param block address of block pointer
        @param topLeftCol top left column
        @param topLeftRow top left row
        @return false if the last part was already returned*/

src/providers/wms/qgstilescalewidget.cpp

@@ -158,7 +158,7 @@ void QgsTileScaleWidget::showTileScale( QMainWindow *mainWindow )
 
   dock->setWidget( tws );
 
-  connect( dock->toggleViewAction(), SIGNAL( triggered( bool ) ), tws, SLOT( scaleEnabled( bool ) ) );
+  connect( dock, SIGNAL( visibilityChanged( bool ) ), tws, SLOT( scaleEnabled( bool ) ) );
 
   QSettings settings;
   dock->setVisible( settings.value( "/UI/tileScaleEnabled", false ).toBool() );