"z" button broken in disk editor

Hi.

The update to the listbox widget broke the "Cycle size units" button
on QT. When pressing it, the list empties and tclh spews:

ERROR: Hui::WidgetCallbackData::activate: Error evaluating Tcl command: ListBox itemno 2 is out of range 0..0

I'm not sure I understand how this happened.

A.
-- 
From the age of uniformity, from the age of solitude, from the age of
Big Brother, from the age of doublethink - greetings!

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