[poppler] Radio buttons and NoToggleToOff

[Albert Astals Cid]

Hi guys, I was having a look at the radio buttons spec/implementation and 
found the NoToggleToOff flag.

Spec says " If set, exactly one radio button shall be selected at
all times; selecting the currently selected button has no effect. If clear,
clicking the selected button deselects it, leaving no button selected."

Which i understand that if the bit is not set means that you can end up having 
a group of radio buttons with none selected when clicking on the selected one.

I modified the attached file so that the vertical radio (Alta/modifcacion/
baja) does not have the NoToggleToOff flag set i.e. /Ff 32768

When loading the file into Adobe Reader it seems it doesn't let me uncheck the 
radio.

Am I reading the spec wrong? Or maybe this this is a bug in Adobe Reader?

Anything else i may have missed?

Cheers,
  Albert
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