[FR]: See which article filters are applied to a feed

[RetroAbstract]

Brief description of the feature request

This feature would allow the user to see exactly which article filters from their filter list are applied to a feed when "Keep article viewer always visible" option in "Articles" tab in "Feeds & articles" menu in settings is checked.

The names of the applied article filters would be displayed next to the currently displayed number of applied articles, for example:

Active message filters: X - (Filter 1, filter 2, filter 3...)

Currently there is only the number of active article filters applied to a feed that is displayed.

Thanks

[martinrotter]

done