Prevent nested slideshow

src/components/slideshow/slideshow.js

@@ -188,6 +188,11 @@ define(['dialogHelper', 'inputManager', 'connectionManager', 'layoutManager', 'f
                 stopInterval();
             });
 
+            // Blur foreign element to prevent starting of "nested" slideshow
+            if (document.activeElement && !dlg.contains(document.activeElement)) {
+                document.activeElement.blur();
+            }
+
             inputManager.on(window, onInputCommand);
             document.addEventListener((window.PointerEvent ? 'pointermove' : 'mousemove'), onPointerMove);