QmlDesigner.propertyEditor: show expressions as tooltips

Expressions are now shown as a tooltip if an expression is set

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

@@ -80,6 +80,7 @@ QWidget { //This is a special doubleSpinBox that does color coding for states
             decimals: 1;
             keyboardTracking: false;
             enabled: !backendValue.isBound && doubleSpinBox.enabled;
+            toolTip: backendValue.isBound ? backendValue.expression : ""
 
             property bool readingFromBackend: false;
             property real valueFromBackend: doubleSpinBox.backendValue.value;

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

@@ -57,6 +57,7 @@ QWidget {
         styleSheet: "QLineEdit { padding-left: 32; }"
         width: lineEdit.width
         height: lineEdit.height
+        toolTip: backendValue.isBound ? backendValue.expression : ""
         
         property string valueFromBackend: (backendValue === undefined || backendValue.value === undefined) ? "" : backendValue.value;
 

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

@@ -65,6 +65,7 @@ QWidget { //This is a special spinBox that does color coding for states
 	    spacing: 4
         QSpinBox {
             property alias backendValue: spinBox.backendValue
+            toolTip: backendValue.isBound ? backendValue.expression : ""
 			
 			enabled: !backendValue.isBound && spinBox.enabled;