Comment 0 for bug 1224892

Currently changing the topic a feed is associated with is done in a feed detail screen.

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Desired solution

Users can drag feeds to another topic. See https://docs.google.com/a/canonical.com/document/d/1UyqrGbTluI6PnqZwnNGagPb2u_VJcq_G-t4CRw6tIOw/edit#heading=h.o2dybcdquopz

If this is impossible, the detail screen is a good intermediate solution, if we:
* Remove 'delete' functionality; see https://bugs.launchpad.net/ubuntu-rssreader-app/+bug/1224890
* Remove ability to edit feed URL and title. We only display the feed title and it is not an editable textfield.

The screen would look like this:
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Edit feed
[Feed title]
Topic: [Feed topic] ▾

Cancel / Done
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