Filtering by application can be very beneficial in the Latest Data view.
The attached patch adds a text box to the filter. Settings are stored in the user profile, exactly as with the existing filter. Both filters work together: Only items matching both conditions are therefore shown. As soon as you filter by application, items without applications assigned are cut out. You can not filter for items without applications explicitly now.
The patch is a draft and made for 2.0.4. I'm not happy with it yet, as the approach is very inefficient. Much rather, the filtering should be done in SQL already.
Two comments are also changed to be more meaningful.
Thanks to Oliver for inspiration and discussion!