This new function allows to set a title with mnemonic.
But also it properly sets the frame label as the mnemonic widget for the
radio buttons, otherwise the mnemonic is mostly bogus and doesn't
actually give focus to the editable widgets (i.e. the radio group).
A proper class for a frame containing radio buttons. This object has a
"value" property and will therefore be very easy to use in various API
binding a config property to a widget property.
A GimpIntRadioFrame is also what gimp_prop_int_radio_frame_new() will
return now.
gimp_prop_int_radio_box_new() on the other hand is being removed. It is
used nowhere and is unneeded. If someone really needs a non-labelled
group of radio buttons, they can also create a GimpIntRadioFrame, remove
the label and hide the borders. At least they will still be able to
easily bind it to a config property.
Jehan