remove populate cache on loading home page

Session/Utilities/MentionUtilities.swift

@@ -10,18 +10,13 @@ public final class MentionUtilities : NSObject {
 
     @objc public static func highlightMentions(in string: String, isOutgoingMessage: Bool, threadID: String, attributes: [NSAttributedString.Key:Any]) -> NSAttributedString {
         let openGroupV2 = Storage.shared.getV2OpenGroup(for: threadID)
-        OWSPrimaryStorage.shared().dbReadConnection.read { transaction in
-            MentionsManager.populateUserPublicKeyCacheIfNeeded(for: threadID, in: transaction)
-        }
         var string = string
         let regex = try! NSRegularExpression(pattern: "@[0-9a-fA-F]{66}", options: [])
-        let knownPublicKeys = MentionsManager.userPublicKeyCache[threadID] ?? [] // Should always be populated at this point
         var mentions: [(range: NSRange, publicKey: String)] = []
         var outerMatch = regex.firstMatch(in: string, options: .withoutAnchoringBounds, range: NSRange(location: 0, length: string.utf16.count))
         while let match = outerMatch {
             let publicKey = String((string as NSString).substring(with: match.range).dropFirst()) // Drop the @
             let matchEnd: Int
-            if knownPublicKeys.contains(publicKey) {
             let context: Contact.Context = (openGroupV2 != nil) ? .openGroup : .regular
             let displayName = Storage.shared.getContact(with: publicKey)?.displayName(for: context)
             if let displayName = displayName {
@@ -31,9 +26,6 @@ public final class MentionUtilities : NSObject {
             } else {
                 matchEnd = match.range.location + match.range.length
             }
-            } else {
-                matchEnd = match.range.location + match.range.length
-            }
             outerMatch = regex.firstMatch(in: string, options: .withoutAnchoringBounds, range: NSRange(location: matchEnd, length: string.utf16.count - matchEnd))
         }
         let result = NSMutableAttributedString(string: string, attributes: attributes)