Improve update behavior

- Suppress reflections
- Keep selection when updating the model

Change-Id: I0e165f0019c8c24802193f3a59902876d4cb5060
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmldesigner/components/curveeditor/animationcurve.cpp

@@ -61,12 +61,12 @@ AnimationCurve::AnimationCurve(const QEasingCurve &easing, const QPointF &start,
     };
 
     QVector<QPointF> points = easing.toCubicSpline();
-    int numSegments = points.count() / 3;
+    int numSegments = points.size() / 3;
 
     Keyframe current;
     Keyframe tmp(start);
 
-    current.setInterpolation(Keyframe::Interpolation::Bezier);
+    current.setInterpolation(Keyframe::Interpolation::Linear);
     tmp.setInterpolation(Keyframe::Interpolation::Bezier);
 
     for (int i = 0; i < numSegments; i++) {
@@ -80,6 +80,8 @@ AnimationCurve::AnimationCurve(const QEasingCurve &easing, const QPointF &start,
 
         m_frames.push_back(current);
 
+        current.setInterpolation(tmp.interpolation());
+
         tmp.setLeftHandle(p2);
         tmp.setPosition(p3);
     }
@@ -189,6 +191,14 @@ QPainterPath AnimationCurve::intersectionPath() const
     return path;
 }
 
+Keyframe AnimationCurve::keyframeAt(size_t id) const
+{
+    if (id >= m_frames.size())
+        return Keyframe();
+
+    return m_frames.at(id);
+}
+
 std::vector<Keyframe> AnimationCurve::keyframes() const
 {
     return m_frames;