PaintedWidth and PaintedHeight are readonly properties of Image control but can be modified in the qt quick designer.

Steps:
1. Create a new qml file and open it in designer mode.
2. Add an Image control to the canvas.
3. Try to change the painted size in the properties window.

Expected Result:
The paintedwidth and paintedHeight properties are readonly. They should not be modified in the designer.

Actually Result:
The two properties can be modified.