qrc/"Change prefix" action in project explorer does not work

The 'Change prefix' action in the context menu for a qrc prefix node in the Projects Pane does not work.

How to reproduce

Create e.g. a new "Qt QUick Application" for Qt Quick 2.0 via the wizard.

Right click on '/' node underneath qml.qrc, select "Change prefix..."

Type a new prefix

What happens

nothing

What I expect to happen

That the prefix is changed and the qml.qrc file is updated accordingly.