[REG 4.2 -> 4.3] Paste in wrong place after running Designer

1. Copy some text, e.g. from a text editor.
2. Open a QML file.
3. Go to Design mode.
4. Go to Edit mode.
5. Select some text in the QML editor:
   
6. Paste.
   The text will be pasted in the wrong place:
   

The pasted text should replace the previously selected text. In Creator 4.2, this worked correctly.