Seems that there are less problems with virt-viewer than with default virt-manager on kvm linux. But still, to reproduce

1) Open estudio into an editor
2) add somewhere in a feature containing code and if with its completion and add any txt, asdf will be sufficient
3) Go with cursor (arrows) below the end of the if and select the lines with shift+arrow-down
3) cut these lines (ctrl+x)
4) move cursor into the if then <cursor> end
5) paste with ctrl+v and it will freeze