[patch #6227] Add validity predicate to dialog boxes

[John Darrington]

Follow-up Comment #2, patch #6227 (project pspp):

Thanks Ben.

The GtkSpinButton case is covered, because it's a special case of GtkEntry so
the GTK_IS_EDITABLE (w) predicate will evaluate to TRUE.

The problem with adding a warning is that there are numerous widgets which
have no user interaction and therefore would need a null handler (eg
GtkLabel).

I can think of a couple of different ways to work around this general
problem, but I'm not entirely happy with either of them.

One widget that isn't covered is GtkComboBox, so I'll add code to catch this
case, and check this in.

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