fix: deleted message still visible in thread issue (#2297)

Author: Ioan Moldovan

FlowCrypt/App/GeneralConstants.swift

@@ -10,8 +10,9 @@ enum GeneralConstants {
         static let redirectURL = URL(string: "com.googleusercontent.apps.679326713487-5r16ir2f57bpmuh2d6dal1bcm9m1ffqc:/oauthredirect")!
         static let mailScope: [GoogleScope] = [.userInfo, .userEmail, .mail]
         static let contactsScope: [GoogleScope] = mailScope + [.contacts, .otherContacts]
+        static let trashLabelPath = "TRASH"
         // Empty pass is For All MAIL
-        static let standardGmailPaths = ["INBOX", "CHAT", "SENT", "IMPORTANT", "TRASH", "DRAFT", "SPAM", "STARRED", "UNREAD", ""]
+        static let standardGmailPaths = ["INBOX", "CHAT", "SENT", "IMPORTANT", trashLabelPath, "DRAFT", "SPAM", "STARRED", "UNREAD", ""]
         static let gmailRecoveryEmailSubjects = [
             "Your FlowCrypt Backup",
             "Your CryptUp Backup",

FlowCrypt/Functionality/Mail Provider/Threads/MessagesThreadApiClient.swift

@@ -72,7 +72,13 @@ extension GmailService: MessagesThreadApiClient {
                         return continuation.resume(throwing: AppErr.cast("GTLRGmail_Thread"))
                     }
 
-                    let messages = gmailThread.messages?.compactMap { try? Message(gmailMessage: $0) } ?? []
+                    var messages = gmailThread.messages?.compactMap { try? Message(gmailMessage: $0) } ?? []
+
+                    // For trash folder: Only display deleted messages in thread
+                    // For othr folders: Exclude deleted messages in thread
+                    // https://github.com/FlowCrypt/flowcrypt-ios/issues/2292
+                    let isTrashFolder = path == GeneralConstants.Gmail.trashLabelPath
+                    messages = messages.filter { $0.labels.contains(.trash) == isTrashFolder }
 
                     let thread = MessageThread(
                         identifier: gmailThread.identifier,