[webui] fix status icon updates when a recording is scheduled/started…

… from the

EPG grid

We can listen on dvrdb comet updates but we should only act on them when the
EPG grid is visible. When it's not visible the update is delayed until the
tab becomes visible again.

src/webui/static/app/epg.js

@@ -658,6 +658,17 @@ tvheadend.epg = function() {
 
     panel.on('rowclick', rowclicked);
 
+    /**
+     * Listener for DVR notifications. We want to update the EPG grid when a
+     * recording is finished/deleted etc. so the status icon gets updated. 
+     * Only do this when the tab is visible, otherwise it won't work as 
+     * expected.
+     */
+    tvheadend.comet.on('dvrdb', function() {
+        if (panel.isVisible())
+            epgStore.reload();
+    });
+
     // Always reload the store when the tab is activated
     panel.on('beforeshow', function() {
         this.store.reload();