add genres to album filters panel

ui/browsing/albumspage.go

@@ -87,7 +87,7 @@ func (a *AlbumsPage) createSearchAndFilter() {
 	a.searcher = widgets.NewSearchEntry()
 	a.searcher.Text = a.searchText
 	a.searcher.OnSearched = a.OnSearched
-	a.filterBtn = widgets.NewAlbumFilterButton(&a.filter)
+	a.filterBtn = widgets.NewAlbumFilterButton(&a.filter, a.mp.GetGenres)
 	a.filterBtn.OnChanged = a.Reload
 }
 

ui/browsing/favoritespage.go

@@ -81,7 +81,7 @@ func (a *FavoritesPage) createHeader(activeBtnIdx int) {
 	a.searcher = widgets.NewSearchEntry()
 	a.searcher.OnSearched = a.OnSearched
 	a.searcher.Entry.Text = a.searchText
-	a.filterBtn = widgets.NewAlbumFilterButton(&a.filter)
+	a.filterBtn = widgets.NewAlbumFilterButton(&a.filter, a.mp.GetGenres)
 	a.filterBtn.FavoriteDisabled = true
 	a.filterBtn.OnChanged = a.Reload
 }

ui/browsing/genrepage.go

@@ -67,7 +67,8 @@ func (g *GenrePage) createSearchAndFilter() {
 	g.searcher = widgets.NewSearchEntry()
 	g.searcher.Text = g.searchText
 	g.searcher.OnSearched = g.OnSearched
-	g.filterBtn = widgets.NewAlbumFilterButton(&g.filter)
+	// genre filter is disabled for this page, so no need to actually call genre list fetching function
+	g.filterBtn = widgets.NewAlbumFilterButton(&g.filter, func() ([]*mediaprovider.Genre, error) { return nil, nil })
 	g.filterBtn.GenreDisabled = true
 	g.filterBtn.OnChanged = g.Reload
 }