Fixed issue #966. Unable to control Approximation scale for arc with length.

(grafted from 758fe0d016a641b390f431447cff60d7c93961c8)

--HG--
branch : develop

ChangeLog.txt

@@ -38,6 +38,7 @@
 - [#962] Failed to load LibEGL.
 - [#963] Bug in tool Point intersect curve and axis.
 - [#964] Assign operator crashes math parser.
+- [#966] Unable to control Approximation scale for arc with length.
 
 # Version 0.6.1 October 23, 2018
 - [#885] Regression. Broken support for multi size measurements.

src/app/valentina/xml/vpattern.cpp

@@ -3164,6 +3164,7 @@ void VPattern::ParseToolArcWithLength(VMainGraphicsScene *scene, QDomElement &do
         const QString lengthFix = initData.length;//need for saving fixed length;
         initData.color = GetParametrString(domElement, AttrColor, ColorBlack);
         initData.penStyle = GetParametrString(domElement, AttrPenStyle, TypeLineLine);
+        initData.approximationScale = GetParametrDouble(domElement, AttrAScale, QChar('0'));
 
         VToolArcWithLength::Create(initData);
         //Rewrite attribute formula. Need for situation when we have wrong formula.

src/libs/vtools/tools/drawTools/toolcurve/vtoolarcwithlength.cpp

@@ -128,6 +128,7 @@ VToolArcWithLength *VToolArcWithLength::Create(VToolArcWithLengthInitData &initD
     VArc *arc = new VArc(calcLength, initData.length, c, calcRadius, initData.radius, calcF1, initData.f1);
     arc->SetColor(initData.color);
     arc->SetPenStyle(initData.penStyle);
+    arc->SetApproximationScale(initData.approximationScale);
 
     if (initData.typeCreation == Source::FromGui)
     {