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They've now deprecated gtk_dialog_get_action_area, because they really want a dialog box's action area to be filled with nothing but buttons controlled by GTK which end the dialog with a response code. But we're accustomed to putting all sorts of other things in our action area - non-buttons, buttons that don't end the dialog, and sub-widgets that do layout - and so I think it's no longer sensible to be trying to coerce our use cases into GtkDialog. Hence, I'm introducing a set of wrapper functions which equivocate between a GtkDialog for GTK1 and GTK2, and a GtkWindow with a vbox in it for GTK3, and I'll lay out the action area by hand. (Not everything has sensible layout and margins in the new GTK3 system yet, but I can sort that out later.) Because the new functions are needed by gtkask.c, which doesn't link against gtkdlg.c or include putty.h, I've put them in a new source file and header file pair gtkmisc.[ch] which is common to gtkask and the main GTK edifice.