Regression to 4.7.1

Steps to reproduce:

• Create a general empty project
• Open Code view and States view
• In States view, select "clicked" state
• In Code view, PropertyChanges are automatically added to "clicked" state 

   PropertyChanges {
                  target: rectangle
              } 

• Click somewhere in Code view
• -> Long list of PropertyChanges are added and even more if you click many times, see picture
• Same happens when you select items in Navigator