Fixed issue #742. Valentina produces wrong seam allowance.

(grafted from e5047109085c16f09270349bc020dbabfb64505f)

--HG--
branch : develop

ChangeLog.txt

@@ -42,6 +42,7 @@
 - [#737] Valentina produces corrupted file if unite two pieces with pins.
 - [#738] Bug in transformation over arc and elliptical arc.
 - [#729] Moved Bezier curves can't be rotated.
+- [#742] Valentina produces wrong seam allowance.
 
 # Version 0.5.0 May 9, 2017
 - [#581] User can now filter input lists by keyword in function wizard.

src/libs/vgeometry/vabstractcubicbezierpath.cpp

@@ -89,6 +89,11 @@ QVector<QPointF> VAbstractCubicBezierPath::GetPoints() const
     QVector<QPointF> pathPoints;
     for (qint32 i = 1; i <= CountSubSpl(); ++i)
     {
+        if (not pathPoints.isEmpty())
+        {
+            pathPoints.removeLast();
+        }
+
         pathPoints += GetSpline(i).GetPoints();
     }
     return pathPoints;

src/libs/vgeometry/vabstractcurve.cpp

@@ -117,7 +117,12 @@ QVector<QPointF> VAbstractCurve::FromBegin(const QVector<QPointF> &points, const
                 if (IsPointOnLineSegment(begin, points.at(i), points.at(i+1)))
                 {
                     theBegin = true;
+
+                    if (begin != points.at(i+1))
+                    {
                         segment.append(begin);
+                    }
+
                     if (i == points.count()-2)
                     {
                          segment.append(points.at(i+1));