handle UrlCache io

Signed-off-by: kernelkind <kernelkind@gmail.com>

crates/notedeck_columns/src/app.rs

@@ -172,6 +172,8 @@ fn unknown_id_send(unknown_ids: &mut UnknownIds, pool: &mut RelayPool) {
 }
 
 fn update_damus(damus: &mut Damus, app_ctx: &mut AppContext<'_>, ctx: &egui::Context) {
+    app_ctx.img_cache.urls.cache.handle_io();
+
     match damus.state {
         DamusState::Initializing => {
             damus.state = DamusState::Initialized;