Select backend in advanced search dialog

[tkem]

Currently, the search URI is always set to the current browse URI. Therefore, it is not possible to limit search to back ends that don't support the browse interface, such as mopidy-youtube.
In the advanced search dialog, a drop-down list could be added that lists all available extensions, and/or URIs from the browse history and/or "default". Thus, user could select a backend for searching, whether it supports browsing or not.

[tkem]

This could also be made a multi-select list, for searching in some, but not all, back ends.

[jcass77]

+1

[tkem]

There seems to be a similar issue with Spotify and its various "browse" backends, at least with current MusicBox RC: https://discuss.mopidy.com/t/mopidy-mobile-and-spotify-search/1798