Idea to fetch all UID's in background

snappymail/v/0.0.0/app/libraries/MailSo/Mail/MailClient.php

@@ -673,20 +673,32 @@ class MailClient
 			throw new \InvalidArgumentException('THREAD not supported');
 		}
 
+		if (!$oInfo->MESSAGES) {
+			$this->logWrite('No messages in '.$oMessageCollection->FolderName);
+			return $oMessageCollection;
+		}
+
 		if (!$oParams->iThreadUid) {
 			$oMessageCollection->NewMessages = $this->getFolderNextMessageInformation(
 				$oParams->sFolderName, $oParams->iPrevUidNext, $oInfo->UIDNEXT
 			);
 		}
 
-		if ($oInfo->MESSAGES) {
 		$bUseSort = $oParams->bUseSort || $oParams->sSort;
 		$aAllThreads = [];
 		$aUnseenUIDs = [];
 		$aUids = [];
 
-			$message_list_limit = $this->oImapClient->Settings->message_list_limit;
+		$message_list_limit = $oParams->bIgnoreLimit ? 0 : $this->oImapClient->Settings->message_list_limit;
 		if (0 < $message_list_limit && $message_list_limit < $oInfo->MESSAGES) {
+/*
+			// TODO: Idea to fetch all UID's in background
+			// Must know what is cached so needs more thought
+			\SnappyMail\Shutdown::add(function($oMailClient, $oParams) {
+				$oParams->bIgnoreLimit = true;
+				$oMailClient->MessageList($oParams);
+			}, [$this, $oParams]);
+*/
 //		if ((0 < $message_list_limit && $message_list_limit < $oInfo->MESSAGES)
 //		 || (!$this->oImapClient->hasCapability('SORT') && !$this->oImapClient->CapabilityValue('THREAD'))) {
 			// Don't use THREAD for speed
@@ -773,9 +785,6 @@ class MailClient
 			$aUids = \array_slice($aUids, $oParams->iOffset, $oParams->iLimit);
 			$this->MessageListByRequestIndexOrUids($oMessageCollection, new SequenceSet($aUids), $aAllThreads, $aUnseenUIDs);
 		}
-		} else {
-			$this->logWrite('No messages in '.$oMessageCollection->FolderName);
-		}
 
 		return $oMessageCollection;
 	}

snappymail/v/0.0.0/app/libraries/MailSo/Mail/MessageListParams.php

@@ -24,7 +24,8 @@ class MessageListParams
 	public bool
 		$bUseSort = true,
 		$bUseThreads = false,
-		$bHideDeleted = true;
+		$bHideDeleted = true,
+		$bIgnoreLimit = false;
 
 	protected int
 		$iOffset = 0,

snappymail/v/0.0.0/app/libraries/snappymail/shutdown.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace SnappyMail;
+
+abstract class Shutdown
+{
+	private static
+		$actions = [],
+		$running = false;
+
+	final public function run() : void
+	{
+		if (!static::$running && \count(static::$actions)) {
+			static::$running = true;
+			\ini_set('display_errors', 0);
+			\ignore_user_abort(true);
+
+			# Flush all output buffers
+			if ($i = \ob_get_level()) {
+				while ($i-- && \ob_end_flush());
+			}
+			\flush();
+
+			if (\is_callable('fastcgi_finish_request')) {
+				// Special FPM/FastCGI (fpm-fcgi) function to finish request and
+				// flush all data while continuing to do something time-consuming.
+				\fastcgi_finish_request();
+			}
+
+			foreach (static::$actions as $action) {
+				try {
+					\call_user_func_array($action[0], $action[1]);
+				} catch (\Throwable $e) { } # skip
+			}
+		}
+	}
+
+	final public function add(callable $function, array $args = []) : void
+	{
+		if (!\count(static::$actions)) {
+			\register_shutdown_function('\\SnappyMail\\Shutdown::run');
+		}
+		static::$actions[] = [$function, $args];
+	}
+}