The last few changes between them have fixed the problem of windows
not closing properly when their sessions terminated. The problem was
really more than one problem - pterm session termination wasn't even
detected due to the missing SIGCHLD handler, window-closing wasn't
done explicitly due to exit_callback() just calling gtk_main_quit
instead of a proper gtk_widget_destroy(), and that in turn wouldn't do
quite the right thing without the g_application_{hold,release} system
which I added in gtkapp.c as part of the non-model config box rework.
Now that all of those are fixed, things seem to be working sensibly;
the OS X Pterm.app and PuTTY.app, and the ordinary X GTK ptermapp and
puttyapp too, now allow windows to be closed independently of each
other, close them automatically in the right way, and automatically
terminate the whole application when the last window is gone.
So I can clean up that TODO item, including its handwavy 'need to work
out some kind of mechanism'. Some kind of mechanism has now been
worked out, and given that there turned out to be a whole cluster of
interacting structural issues, no wonder I wasn't _quite_ sure what it
ought to be!
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