Steps to reproduce:

• create/open Qt Quick 2 UI
• add a string property to the root component (including a value)
• switch to Designer view
• select a Text element
• for the text property click the small drop down before the current value and select 'Set Binding'
• enter something wrong (for me entering "=propertyName" (without the quotes) worked), the message box regarding rewiring the doc should appear
• try to click on any of the line edits currently visible and modify its value

Current behaviour:

• none of the current LineEdits take an input, you have to select another QML element (and switch back to the former one) or switch to Edit and back to Design view if you want to edit a line edit