QmlDesigner: Do not allow certain ids

Some ids are likely to create issues, because they collide
with property names.

Change-Id: I688ed0751c227afdd3ef59ba0f31b1334b26eaea
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/qmldesigner/designercore/model/modelnode.cpp

@@ -179,6 +179,42 @@ static bool idIsQmlKeyWord(const QString& id)
     return keywords.contains(id);
 }
 
+static bool isIdToAvoid(const QString& id)
+{
+    static const QSet<QString> ids = {
+        "top",
+        "bottom",
+        "left",
+        "right",
+        "width",
+        "height",
+        "x",
+        "y",
+        "opacity",
+        "parent",
+        "item",
+        "flow",
+        "color",
+        "margin",
+        "padding",
+        "border",
+        "font",
+        "text",
+        "source",
+        "state",
+        "visible",
+        "focus",
+        "data",
+        "clip",
+        "layer",
+        "scale",
+        "enabled",
+        "anchors"
+    };
+
+    return ids.contains(id);
+}
+
 static bool idContainsWrongLetter(const QString& id)
 {
     static QRegExp idExpr(QStringLiteral("[a-z_][a-zA-Z0-9_]*"));
@@ -187,7 +223,7 @@ static bool idContainsWrongLetter(const QString& id)
 
 bool ModelNode::isValidId(const QString &id)
 {
-    return id.isEmpty() || (!idContainsWrongLetter(id) && !idIsQmlKeyWord(id));
+    return id.isEmpty() || (!idContainsWrongLetter(id) && !idIsQmlKeyWord(id)) && !isIdToAvoid(id);
 }
 
 bool ModelNode::hasId() const