QmlDesigner.propertyEditor: crash fix

We did not handle the case that a gradient is a binding.

Change-Id: Ib6892420c6d5de7522cb2b051ff2b046ab781c14
Reviewed-on: http://codereview.qt.nokia.com/2503Reviewed-by: Thomas Hartmann <Thomas.Hartmann@nokia.com>

share/qtcreator/qmldesigner/propertyeditor/Qt/RectangleColorGroupBox.qml

@@ -48,6 +48,8 @@ GroupBox {
     property variant colorAlpha: colorGroupBox.alpha
     property bool hasGradient: backendValues.gradient.isInModel
 
+    property bool gradientIsBinding: backendValues.gradient.isBound
+
     onHasGradientChanged: {
         print("onGradientInModelChanged")
         if (backendValues.gradient.isInModel) {
@@ -75,7 +77,7 @@ GroupBox {
         isSetup = true;
         gradientLine.active = false;
         colorGroupBox.setSolidButtonChecked = true;
-        if (backendValues.gradient.isInModel) {
+        if (backendValues.gradient.isInModel && !gradientIsBinding) {
             colorGroupBox.setGradientButtonChecked = true;
             gradientLine.active = true;
             gradientLine.setupGradient();
@@ -117,6 +119,8 @@ GroupBox {
         }
 
         ColorGroupBox {
+            enabled: !gradientIsBinding
+            opacity: gradientIsBinding ? 0.7 : 1
             id: colorGroupBox
             caption: qsTr("Rectangle")
             finished: finishedNotify

src/plugins/qmldesigner/components/propertyeditor/gradientlineqmladaptor.cpp

@@ -85,6 +85,9 @@ void GradientLineQmlAdaptor::setupGradient()
     if (!modelNode.isValid())
         return;
 
+    if (modelNode.hasBindingProperty(gradientName()))
+        return;
+
     if (modelNode.hasProperty(gradientName())) { //gradient exists
 
         ModelNode gradientNode = modelNode.nodeProperty(gradientName()).modelNode();