Greying out preferences

[Robert Cragie <robert.cragie () gridmerge com>]

I was wondering if there is an easy way to grey out another GUI item based
on e.g. selecting a radio button or dropdown for a protocol's preferences.
I can't see anything obvious in prefs.c. The only thing which looked like
what I wanted to do was in the top level User Interface preferences where
the "File Open" dialog behavior radio button greys out or enables the
"Directory" edit box. I looked at this code and it looked very GTK
specific. I also took a quick look through some of the other protocol
preferences and none of the ones I came across seems to do this dynamic
enabling/disabling.

Thanks in advance,

Robert

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