[composer] Default to miter style for shapes and page background

Author: nyalldawson

src/core/composer/qgscomposershape.cpp

@@ -81,6 +81,7 @@ void QgsComposerShape::createDefaultShapeStyleSymbol()
   properties.insert( "style_border", "solid" );
   properties.insert( "color_border", "black" );
   properties.insert( "width_border", "0.3" );
+  properties.insert( "joinstyle", "miter" );
   mShapeStyleSymbol = QgsFillSymbolV2::createSimple( properties );
 
   mMaxSymbolBleed = QgsSymbolLayerV2Utils::estimateMaxSymbolBleed( mShapeStyleSymbol );

src/core/composer/qgscomposition.cpp

@@ -277,6 +277,7 @@ void QgsComposition::createDefaultPageStyleSymbol()
   properties.insert( "color", "white" );
   properties.insert( "style", "solid" );
   properties.insert( "style_border", "no" );
+  properties.insert( "joinstyle", "miter" );
   mPageStyleSymbol = QgsFillSymbolV2::createSimple( properties );
 }