Fixed full screen react demo glitch.

packages/module/patternfly-docs/content/extensions/react-log-viewer/demos/ComplexToolbarLogViewer.jsx

@@ -74,6 +74,31 @@ const ComplexToolbarLogViewer = () => {
     }
   }, [isPaused, buffer]);
 
+  //Listening escape key on full screen mode.
+  React.useEffect(() => {
+    const handleFullscreenChange = () => {
+      const isFullscreen =
+        document.fullscreenElement ||
+        document.mozFullScreenElement ||
+        document.webkitFullscreenElement ||
+        document.msFullscreenElement;
+
+      setIsFullScreen(!!isFullscreen);
+    };
+
+    document.addEventListener('fullscreenchange', handleFullscreenChange);
+    document.addEventListener('mozfullscreenchange', handleFullscreenChange);
+    document.addEventListener('webkitfullscreenchange', handleFullscreenChange);
+    document.addEventListener('msfullscreenchange', handleFullscreenChange);
+
+    return () => {
+      document.removeEventListener('fullscreenchange', handleFullscreenChange);
+      document.removeEventListener('mozfullscreenchange', handleFullscreenChange);
+      document.removeEventListener('webkitfullscreenchange', handleFullscreenChange);
+      document.removeEventListener('msfullscreenchange', handleFullscreenChange);
+    };
+  }, []);
+
   const onExpandClick = _event => {
     const element = document.querySelector('#complex-toolbar-demo');