Patch dgg chat stealing focus issue (not a proper fix)

This addresses github.com/MemeLabs/Rustla2/issues/117
Not a proper fix, as typing in chat directly after switching will steal a few
characters mid sentence.
Though it's better than nothing, until we can implement a proper fix.

assets/chat/js/chat.js

@@ -338,8 +338,18 @@ class Chat {
         // Visibility
         document.addEventListener('visibilitychange', debounce(100, () => {
             this.ishidden = (document['visibilityState'] || 'visible') !== 'visible';
-            if (!this.ishidden) focusIfNothingSelected(this);
-            else ChatMenu.closeMenus(this);
+
+            if (!this.ishidden) {
+                focusIfNothingSelected(this);
+
+                // Shotgun some focus requests to battle an external focus steal
+                // github.com/MemeLabs/Rustla2/issues/117
+                setTimeout(() => focusIfNothingSelected(this), 1600);
+                setTimeout(() => focusIfNothingSelected(this), 1800);
+                setTimeout(() => focusIfNothingSelected(this), 2000);
+            } else {
+                ChatMenu.closeMenus(this);
+            }
         }), true);
 
         // Resize