[NbtkEntry] delete the current selected text on paste
[NbtkEntry] delete the current selected text on paste

Paste should replace the current selection with text from the clipboard.

clutter-project/mx,jonnylamb/mx,clutter-project/mx,clutter-project/mx,jonnylamb/mx,jonnylamb/mx,pwithnall/mx,clutter-project/mx,pwithnall/mx,pwithnall/mx,pwithnall/mx,jonnylamb/mx