Fixes #2861 Fix panels being closed on pause (#3198)

* Fixes NullPointerException

* Fix library restore issues

Author: keianhzo

app/src/common/shared/org/mozilla/vrbrowser/VRBrowserActivity.java

@@ -437,9 +437,6 @@ protected void onPause() {
             // Also prevents a deadlock in onDestroy when the BrowserWidget is released.
             exitImmersiveSync();
         }
-        // If we are in fullscreen or immersive VR video, we need to consume their back handlers
-        // before pausing to prevent the windows from getting stuck in fullscreen mode.
-        flushBackHandlers();
 
         mAudioEngine.pauseEngine();
 

app/src/common/shared/org/mozilla/vrbrowser/ui/views/VectorClippedEventDelegate.java

@@ -138,7 +138,7 @@ public boolean onTouch(View v, MotionEvent event) {
     }
 
     public boolean isInside(MotionEvent event) {
-        return mRegion.contains((int)event.getX(),(int) event.getY());
+        return event != null && mRegion != null && mRegion.contains((int)event.getX(),(int) event.getY());
     }
 
 }

app/src/common/shared/org/mozilla/vrbrowser/ui/widgets/NavigationBarWidget.java

@@ -401,6 +401,8 @@ public void onConfigurationChanged(Configuration newConfig) {
     public void onPause() {
         super.onPause();
         mBinding.navigationBarNavigation.urlBar.onPause();
+        exitFullScreenMode();
+        exitVRVideo();
     }
 
     @Override
@@ -601,7 +603,7 @@ private void enterFullScreenMode() {
     }
 
     private void exitFullScreenMode() {
-        if (mAttachedWindow == null) {
+        if (mAttachedWindow == null || !mViewModel.getIsFullscreen().getValue().get()) {
             return;
         }
 

app/src/main/res/layout/navigation_bar_fullscreen.xml

@@ -15,7 +15,7 @@
         android:layout_height="wrap_content"
         android:layout_gravity="center"
         android:background="@drawable/resize_bar_background"
-        android:visibility="gone">
+        app:visibleGone="@{viewmodel.isFullscreen}">
 
         <FrameLayout
             android:layout_width="5dp"