Fix : Duplicate messages can occur when two campaigns are triggered by different events (#9138)

* [fixed] Duplicate messages can occur when two campaigns are triggered by different events in In-App Messaging (#9070).

Author: eldhosembabu

FirebaseInAppMessaging/CHANGELOG.md

@@ -1,5 +1,6 @@
 # 2021-12 -- v8.11.0
 - [fixed] InApp message is shown every new session (#8907).
+- [fixed] Duplicate messages can occur when two campaigns are triggered by different events in In-App Messaging (#9070).
 
 # 2021-8 -- v8.6.0
 - [changed] Replaced conditionally-compiled APIs with `API_UNAVAILABLE` annotations on unsupported platforms (#8480).

FirebaseInAppMessaging/Sources/Flows/FIRIAMDisplayExecutor.m

@@ -616,6 +616,8 @@ - (void)checkAndDisplayNextContextualMessageForAnalyticsEvent:(NSString *)eventN
 - (void)displayForMessage:(FIRIAMMessageDefinition *)message
               triggerType:(FIRInAppMessagingDisplayTriggerType)triggerType {
   _currentMsgBeingDisplayed = message;
+  self.isMsgBeingDisplayed = YES;
+
   [message.renderData.contentData
       loadImageDataWithBlock:^(NSData *_Nullable standardImageRawData,
                                NSData *_Nullable landscapeImageRawData, NSError *_Nullable error) {
@@ -633,6 +635,7 @@ - (void)displayForMessage:(FIRIAMMessageDefinition *)message
                                             triggerType:triggerType];
           // short-circuit to display error handling
           [self displayErrorForMessage:erroredMessage error:error];
+          self.isMsgBeingDisplayed = NO;
           return;
         } else {
           if (standardImageRawData) {
@@ -658,11 +661,11 @@ - (void)displayForMessage:(FIRIAMMessageDefinition *)message
         if (self.suppressMessageDisplay) {
           FIRLogDebug(kFIRLoggerInAppMessaging, @"I-IAM400042",
                       @"Message display suppressed by developer at message display time.");
+          self.isMsgBeingDisplayed = NO;
           return;
         }
 
         self.impressionRecorded = NO;
-        self.isMsgBeingDisplayed = YES;
 
         FIRInAppMessagingDisplayMessage *displayMessage =
             [self displayMessageWithMessageDefinition:message