The rest of the menulist bindings have this, and is used to properly size
the menupopup when the menulist is opened. Without it, for long menulists
with a scrollbar, and short labels, the labels will get squeezed out during
layout and not be visible.
--HG--
extra : rebase_source : dea73f0b955cc72a0eb3f3e9e4df01187579ec83
extra : histedit_source : 5bb432c6afa96cfb73ca1535724a1d630ea1d5ca