QuickDesigner: Designer does not respect minimum/maximum value

Steps to reproduce:

• create/open Qt Quick Application
• switch to Designer
• drag a ProgressBar or Spinner onto the view
• inside Properties decrease/increase the current value (no matter if doing this using mouse or the edit part)

Current behaviour:

• you can set value below minimum value
• you can set value higher than maximum value

Expected behaviour:

• minimum and maximum values are respected when setting value