This uncovered another bug with the "String" property of pushbuttons so I guess it was useful.

I fixed things in this cset https://hg.savannah.gnu.org/hgweb/octave/rev/1a12d4369beb.

Closing report.

I didn't realize it was a regression. Bisect found the bug was introduced with this changeset:

https://hg.savannah.gnu.org/hgweb/octave/rev/88e87c69c8b8

If one runs the following:

h = figure;
u = uicontrol(h,'Style','togglebutton','String','Octave');
set(u,'Value',~get(u,'value'));
set(u,'Value',~get(u,'value'));
set(u,'Value',~get(u,'value'));
set(u,'Value',~get(u,'value'));

one would expect the togglebutton to change its appearance to reflect its new value.