[Straw-devel] category subscriptions!

[Juri Pakaste]

Committed.

It seems to do the basics right (allow, from the preferences dialog, to
mark a category as being subscribed from somewhere, when polling a
category poll that remote location and subscribe to any new feeds and
remove any feeds that a) are not in the file and b) were added from a
subscription), but there's  still lots to be done.

1) No error display, no progress feed, no nothing. It displays nothing
about what's going on with the category poll in the user interface. Any
suggestions are very welcome.

2) It only polls the category contents when doing "Poll category". Yeah,
it sucks. At least it should be added to the poll all command, but I
suppose that most people other than me use automatic polling with
timers. When should these be polled? Should we put a fixed timer there?
Put an frequency setting field in the preferences dialog?

3) Addition of a new feed doesn't result in it being polled. It'll only
be polled the next time.

4) Probably something else, too.

5) There's plenty of noise to the console, that can be removed when the
other issues are resolved.

There's a new module, ValueMonitor, that can be used to monitor the
value of a field. We could and maybe should convert some other places to
use that too, at least the main window resizing code uses basically the
same idiom (monitor value with a timer, when it's no longer changing
notify the configuration system) so it might use this. Possibly also
some other entry fields.

I'll try to look into those patches this evening.

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