If you activate a PG_LineEdit object (i.e. give it the focus), and then destroy the widget containing this object, the widget will first hide, then destroy all its children. When hiding, the lineedit will submit a message "lost focus" addressed to itself to the queue. Then it is deleted. However, the message is only processed after the widget has finished destroying its children, so this algorithm leads to a definite segfault
- create a widget with a PG_LineEdit or related object
- give the edit the focus
- delete the widget

One can circumvent this bug by manually hiding the edit a while before the widget is deleted, but nevertheless, this bug is nasty.