When pedigree node menu does not fit on screen completely and has a scroll bar there are UI usability issues

When there is a scrollbar, typing anything in the comments field (or any other field low enough in the dialogue to not be visible when scroll bar is in the top position) causes scroll position to reset (after each key-press) and the field being edited to go out of view (e.g. user wont be able to see what is being typed)