Possible fix for FIAM crash when trying to clear image loading (#3506)

* Possible fix for FIAM crash when trying to clear image loading when activity is paused. This could happen when the parent activity is paused and FIAM image loading is in progress (ie. FIAM window is not yet shown) Internal tracking bug: b/221776899

* Changing tests to account for the fix.

Author: eldhosembabu

firebase-inappmessaging-display/src/main/java/com/google/firebase/inappmessaging/display/FirebaseInAppMessagingDisplay.java

@@ -224,7 +224,6 @@ private void unbindFiamFromActivity(Activity activity) {
         && currentlyBoundActivityName.equals(activity.getLocalClassName())) {
       Logging.logi("Unbinding from activity: " + activity.getLocalClassName());
       headlessInAppMessaging.clearDisplayListener();
-      imageLoader.cancelTag(activity.getClass());
       removeDisplayedFiam(activity);
       currentlyBoundActivityName = null;
     }
@@ -507,6 +506,7 @@ private void dismissFiam(Activity activity) {
 
   private void removeDisplayedFiam(Activity activity) {
     if (windowManager.isFiamDisplayed()) {
+      imageLoader.cancelTag(activity.getClass());
       windowManager.destroy(activity);
       cancelTimers();
     }

firebase-inappmessaging-display/src/test/java/com/google/firebase/inappmessaging/display/FirebaseInAppMessagingDisplayTest.java

@@ -247,6 +247,7 @@ public void onActivityPaused_clearsDisplayListener() {
   @Test
   public void onActivityPaused_clearsImageDownload() {
     resumeActivity(activity);
+    when(windowManager.isFiamDisplayed()).thenReturn(true);
     pauseActivity(activity);
 
     verify(imageLoader).cancelTag(activity.getClass());