Add AppImage metadata extraction, display, and bug fixes

src/ui/library_view.rs

@@ -342,9 +342,13 @@ impl LibraryView {
                 let view_mode_d = view_mode_ref.clone();
                 let search_empty_d = search_empty_ref.clone();
 
+                let debounce_clear = debounce_source.clone();
                 let source_id = glib::timeout_add_local_once(
                     std::time::Duration::from_millis(150),
                     move || {
+                        // Clear the stored SourceId so nobody tries to remove a fired timer
+                        debounce_clear.set(None);
+
                         let recs = records_d.borrow();
                         let match_flags: Vec<bool> = recs
                             .iter()