Many thanks for fixing this.

Concerning #comment1 (default values for 'color' and 'checked' properties), do you think they should be modified to match Matlab's and if so, shall I open a new bug report?

Correct. And since those widgets all derive from BaseControl, the change is actually only needed in one place.

The edit, listbox, popupmenu, and text uicontrols do not use QAbstractButtons, so the same syntax does not apply.

Thanks, confirmed here. Looks like an easy string replacement task in libgui/graphics.

The character '&' is wrongly interpreted in the 'String' property of a uicontrol (this was already mentioned in item 4 of bug #44672):

F = figure;
uicontrol(F,'units','normalized','Style','checkbox','String','A & B','Position',[0.3 0.8 0.4 0.09]);
uicontrol(F,'units','normalized','Style','edit','String','A & B','Position',[0.3 0.7 0.4 0.09]);
uicontrol(F,'units','normalized','Style','listbox','String','A & B','Position',[0.3 0.6 0.4 0.09]);
uicontrol(F,'units','normalized','Style','popupmenu','String','A & B','Position',[0.3 0.5 0.4 0.09]);
uicontrol(F,'units','normalized','Style','pushbutton','String','A & B','Position',[0.3 0.4 0.4 0.09]);
uicontrol(F,'units','normalized','Style','radiobutton','String','A & B','Position',[0.3 0.3 0.4 0.09]);
uicontrol(F,'units','normalized','Style','text','String','A & B','Position',[0.3 0.2 0.4 0.09]);
uicontrol(F,'units','normalized','Style','togglebutton','String','A & B','Position',[0.3 0.1 0.4 0.09]);

A screenshot of the display in Octave and Matlab is attached: the problem is with checkbox, pushbutton, radiobutton and togglebutton.

The underscore seems to correspond to an access key, meaning that the '&' is interpreted in the way it is for uimenus; using '&&' for the problematic uicontrols fixes the display.