Correctly release SendTabDialog in onDestroy (#2928)

Author: MortimerGoro

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

@@ -374,8 +374,13 @@ public void releaseWidget() {
         }
 
         detachFromWindow();
-
         mAttachedWindow = null;
+
+        if (mSendTabDialog != null && !mSendTabDialog.isReleased()) {
+            mSendTabDialog.releaseWidget();
+        }
+        mSendTabDialog = null;
+
         super.releaseWidget();
     }
 

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

@@ -159,6 +159,10 @@ public void attachToWindow(WindowWidget aWindow) {
 
     @Override
     public void releaseWidget() {
+        if (mSendTabDialog != null && !mSendTabDialog.isReleased()) {
+            mSendTabDialog.releaseWidget();
+        }
+        mSendTabDialog = null;
         super.releaseWidget();
     }
 

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

@@ -459,6 +459,10 @@ public void onResume() {
     }
 
     public void onDestroy() {
+        if (mTabsWidget != null && !mTabsWidget.isReleased()) {
+            mTabsWidget.releaseWidget();
+            mTabsWidget = null;
+        }
         mDelegate = null;
         for (WindowWidget window: mRegularWindows) {
             window.close();

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

@@ -33,7 +33,9 @@ private void initialize() {
 
     @Override
     public void releaseWidget() {
-        mWidgetManager.removeWorldClickListener(this);
+        if (mWidgetManager != null) {
+            mWidgetManager.removeWorldClickListener(this);
+        }
         mDialogs.remove(this);
         super.releaseWidget();
     }