gui: Refilter playlists when adding tracks

I was running into a situation where new tracks added to a playlist were
showing up even if they didn't match the current filter text.  Let's fix
this by refiltering the current playlist when new tracks are added to
it.

Fixes #114: New tracks added to filtered view
Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

gui/filter.c

@@ -134,3 +134,9 @@ GtkTreePath *gui_filter_path_from_index(unsigned int index)
 	gtk_tree_path_free(real);
 	return path;
 }
+
+void gui_filter_refilter(struct playlist *playlist)
+{
+	if (!playlist || playlist == gui_model_get_playlist())
+		gtk_tree_model_filter_refilter(gui_filter_get());
+}

gui/playlist.c

@@ -37,6 +37,7 @@ static void __gui_playlist_alloc(struct playlist *playlist)
 static void __gui_playlist_added(struct playlist *playlist, struct track *track)
 {
 	gui_model_add(playlist, track);
+	gui_filter_refilter(playlist);
 	__gui_playlist_update_size(playlist);
 }
 

include/gui/filter.h

@@ -38,6 +38,9 @@ unsigned int gui_filter_path_get_index(GtkTreePath *);
 /* Called to convert a playlist iterator index into a path. */
 GtkTreePath *gui_filter_path_from_index(unsigned int);
 
+/* Called to refilter a playlist.  Pass NULL to refilter the current playlist */
+void gui_filter_refilter(struct playlist *);
+
 /* Called to access the filter search-entry. */
 static inline GtkSearchEntry *gui_filter_search(void)
 {