QuickDesigner: Strange layout of Application Output's tab

Steps to reproduce:

• create/open any kind of project, build and run it (optional)
• open/create a Quick Application (or similar) which has a QML file for editing in Design mode
• switch to Design mode for the QML file
• run the project from Designer mode OR if you did the optional first step just open the Application Output pane

Current result:

• the tab(s) do(es) not look right (see attached image)

Expected result:

• tabs do look the same as when in Edit mode