Use width assistant for arrow width/start width

Author: nyalldawson

src/core/symbology-ng/qgssymbollayer.cpp

@@ -83,8 +83,8 @@ void QgsSymbolLayer::initPropertyDefinitions()
     { QgsSymbolLayer::PropertyHorizontalAnchor, QgsPropertyDefinition( "hAnchor", QObject::tr( "Horizontal anchor point" ), QgsPropertyDefinition::HorizontalAnchor )},
     { QgsSymbolLayer::PropertyVerticalAnchor, QgsPropertyDefinition( "vAnchor", QObject::tr( "Vertical anchor point" ), QgsPropertyDefinition::VerticalAnchor )},
     { QgsSymbolLayer::PropertyLayerEnabled, QgsPropertyDefinition( "enabled", QObject::tr( "Layer enabled" ), QgsPropertyDefinition::Boolean )},
-    { QgsSymbolLayer::PropertyArrowWidth, QgsPropertyDefinition( "arrowWidth", QObject::tr( "Arrow line width" ), QgsPropertyDefinition::DoublePositive )},
-    { QgsSymbolLayer::PropertyArrowStartWidth, QgsPropertyDefinition( "arrowStartWidth", QObject::tr( "Arrow line start width" ), QgsPropertyDefinition::DoublePositive )},
+    { QgsSymbolLayer::PropertyArrowWidth, QgsPropertyDefinition( "arrowWidth", QObject::tr( "Arrow line width" ), QgsPropertyDefinition::StrokeWidth )},
+    { QgsSymbolLayer::PropertyArrowStartWidth, QgsPropertyDefinition( "arrowStartWidth", QObject::tr( "Arrow line start width" ), QgsPropertyDefinition::StrokeWidth )},
     { QgsSymbolLayer::PropertyArrowHeadLength, QgsPropertyDefinition( "arrowHeadLength", QObject::tr( "Arrow head length" ), QgsPropertyDefinition::DoublePositive )},
     { QgsSymbolLayer::PropertyArrowHeadThickness, QgsPropertyDefinition( "arrowHeadThickness", QObject::tr( "Arrow head thickness" ), QgsPropertyDefinition::DoublePositive )},
     { QgsSymbolLayer::PropertyArrowHeadType, QgsPropertyDefinition( "arrowHeadType", QObject::tr( "Arrow head type" ), QgsPropertyDefinition::IntegerPositive )},