Under qt, the split table doesn't expand as much as it should and stops expanding after a while. It shouldn't.
(from [a532b2ef0266]) [#255 state:fixed] Made the split table in transaction_panel always grow with the panel (qt).
(from [60e4e6377678]) [#255] De-UI-ified transaction_panel.
I couldn't figure out how to make QFormLayout items not having that kind of hard vertical limit that it was having before, to no avail. I removed the split table from the form layout and put it, along with the split buttons, in a vertical layout.