migrate to Fyne 2.6 - WIP - updates for new threading model

ui/browsing/playlistpage.go

@@ -193,20 +193,28 @@ func (a *PlaylistPage) doSetNewTrackOrder(ids []string, newPos int) {
 		}
 	}
 	newTracks := sharedutil.ReorderItems(a.tracks, idxs, newPos)
+	ids = sharedutil.TracksToIDs(newTracks)
+
 	// we can't block the UI waiting for the server so assume it will succeed
 	go func() {
-		ids = sharedutil.TracksToIDs(newTracks)
 		if err := a.sm.Server.ReplacePlaylistTracks(a.playlistID, ids); err != nil {
 			log.Printf("error updating playlist: %s", err.Error())
+			fyne.Do(func() {
+				a.contr.ToastProvider.ShowErrorToast(
+					lang.L("An error occurred updating the playlist"),
+				)
+			})
+		} else {
+			fyne.Do(func() {
+				renumberTracks(newTracks)
+				// force-switch back to unsorted view to show new track order
+				a.tracklist.SetSorting(widgets.TracklistSort{})
+				a.tracklist.SetTracks(newTracks)
+				a.tracklist.UnselectAll()
+				a.tracks = newTracks
+			})
 		}
 	}()
-
-	renumberTracks(newTracks)
-	// force-switch back to unsorted view to show new track order
-	a.tracklist.SetSorting(widgets.TracklistSort{})
-	a.tracklist.SetTracks(newTracks)
-	a.tracklist.UnselectAll()
-	a.tracks = newTracks
 }
 
 func (a *PlaylistPage) onRemoveSelectedFromPlaylist() {