Make message processing quicker. Remove Undo from display

index.php

@@ -509,8 +509,10 @@ echo <<< HTML
 HTML;
 		//	Get all the files in the directory
 		$message_files = array_reverse( glob( $directories[$directory] . "/*.json") );
-		//	Keep the most recent 200
+		//	There are lots of messages. The UI will only show 200.
-		$message_files = array_slice( $message_files, 0, 200 ); 
+		//	However, there will be lots of duplicates, updates, etc.
+		//	This looks through the most recent 1,000
+		$message_files = array_slice( $message_files, 0, 1000 ); 
 
 		//	Loop through the messages:
 		//	Remove any which have been updated.
@@ -521,6 +523,10 @@ HTML;
 			//	Get the contents of the JSON 
 			$message = json_decode( file_get_contents( $message_file ), true );
 
+			//	Ignore any messages which aren't for display
+			$type = $message["type"];
+			if ( "Undo" == $type ) { continue; }
+
 			//	Get the ID
 			if ( isset( $message["object"]["id"] ) ) {
 				$id = $message["object"]["id"];
@@ -554,6 +560,8 @@ HTML;
 
 		//	Sort with newest on top
 		krsort( $messages_ordered );
+		//	Only keep the most recent 200
+		$messages_ordered = array_slice( $messages_ordered, 0, 200 );
 	
 		//	HTML is *probably* sanitised by the sender. But let's not risk it, eh?
 		//	Using the allow-list from https://docs.joinmastodon.org/spec/activitypub/#sanitization