fix for screen update problems with composer grid annotations

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@11868 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: mhugent

src/core/composer/qgscomposermap.cpp

@@ -1246,15 +1246,15 @@ double QgsComposerMap::maxExtension() const
   QList< QPair< double, QLineF > >::const_iterator it = xLines.constBegin();
   for ( ; it != xLines.constEnd(); ++it )
   {
-    currentAnnotationString = QString::number( it->first );
+    currentAnnotationString = QString::number( it->first, 'f', mGridAnnotationPrecision );
     currentExtension = std::max( textWidthMillimeters( mGridAnnotationFont, currentAnnotationString ), fontAscentMillimeters( mGridAnnotationFont ) );
     maxExtension = std::max( maxExtension, currentExtension );
   }
 
   it = yLines.constBegin();
   for ( ; it != yLines.constEnd(); ++it )
   {
-    currentAnnotationString = QString::number( it->first );
+    currentAnnotationString = QString::number( it->first, 'f', mGridAnnotationPrecision );
     currentExtension = std::max( textWidthMillimeters( mGridAnnotationFont, currentAnnotationString ), fontAscentMillimeters( mGridAnnotationFont ) );
     maxExtension = std::max( maxExtension, currentExtension );
   }