QmlDebugging: Assign Value in Debugger

Call EXEC instead of SET_PROPERTY for assigning a value
in Locals and Expressions. Also check if the id of the
object is valid before calling EXPAND.

Task-number: QTCREATORBUG-7089
Change-Id: I2769e5345cfb7ecf87e36125821f141821556690
Reviewed-by: Christian Stenger <christian.stenger@nokia.com>

src/plugins/debugger/qml/qscriptdebuggerclient.h

@@ -72,8 +72,8 @@ public:
     void changeBreakpoint(const BreakpointModelId &id);
     void synchronizeBreakpoints();
 
-    void assignValueInDebugger(const QByteArray expr, const quint64 &id,
-                                       const QString &property, const QString &value);
+    void assignValueInDebugger(const WatchData *data, const QString &expression,
+                                       const QVariant &valueV);
 
     void updateWatchData(const WatchData &data);
     void executeDebuggerCommand(const QString &command);