Resolve #1338

dev/Model/Message.js

@@ -79,6 +79,7 @@ export class MessageModel extends AbstractModel {
 			subject: '',
 			plain: '',
 			html: '',
+			preview: null,
 			size: 0,
 			spamScore: 0,
 			spamResult: '',

dev/View/Popup/Domain.js

@@ -37,6 +37,7 @@ const
 		imapDisable_thread: false,
 		imapDisable_binary: false,
 		imapDisable_status_size: true,
+		imapDisable_preview: true,
 		imapExpunge_all_on_delete: false,
 		imapFast_simple_search: true,
 		imapFetch_new_messages: true,
@@ -88,6 +89,7 @@ const
 			disable_thread:  !!oDomain.imapDisable_thread(),
 			disable_binary:  !!oDomain.imapDisable_binary(),
 			disable_status_size:  !!oDomain.imapDisable_status_size(),
+			disable_preview:  !!oDomain.imapDisable_preview(),
 			folder_list_limit: pInt(oDomain.imapFolder_list_limit()),
 			message_list_limit: pInt(oDomain.imapMessage_list_limit())
 /*

snappymail/v/0.0.0/app/domains/default.json

@@ -29,6 +29,7 @@
         "disable_thread": false,
         "disable_binary": false,
         "disable_status_size": true,
+        "disable_preview": true,
         "use_expunge_all_on_delete": false,
         "fast_simple_search": true,
         "force_select": false,

snappymail/v/0.0.0/app/libraries/MailSo/Imap/ImapClient.php

@@ -330,6 +330,9 @@ class ImapClient extends \MailSo\Net\NetClient
 			if ($this->Settings->disable_status_size) {
 				$aList = \array_diff($aList, ['STATUS=SIZE']);
 			}
+			if ($this->Settings->disable_preview) {
+				$aList = \array_diff($aList, ['PREVIEW']);
+			}
 		}
 		$this->aCapabilityItems = $aList;
 	}

snappymail/v/0.0.0/app/libraries/MailSo/Imap/Settings.php

@@ -30,6 +30,8 @@ class Settings extends \MailSo\Net\ConnectSettings
 		$disable_binary = false,
 		// STATUS SIZE can take a significant amount of time, therefore not active by default
 		$disable_status_size = true,
+		// RFC 8970
+		$disable_preview = true,
 		$expunge_all_on_delete = false,
 		$fast_simple_search = true,
 		$fetch_new_messages = true,
@@ -56,6 +58,7 @@ class Settings extends \MailSo\Net\ConnectSettings
 			'disable_thread',
 			'disable_binary',
 			'disable_status_size',
+			'disable_preview',
 			'expunge_all_on_delete',
 			'fast_simple_search',
 			'fetch_new_messages',
@@ -95,6 +98,7 @@ class Settings extends \MailSo\Net\ConnectSettings
 				'disable_thread' => $this->disable_thread,
 				'disable_binary' => $this->disable_binary,
 				'disable_status_size' => $this->disable_status_size,
+				'disable_preview' => $this->disable_preview,
 				'use_expunge_all_on_delete' => $this->expunge_all_on_delete,
 //				'body_text_limit' => $this->body_text_limit,
 				'fast_simple_search' => $this->fast_simple_search,

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

@@ -467,14 +467,18 @@ class MailClient
 		array &$aAllThreads = [], array &$aUnseenUIDs = []) : void
 	{
 		if (\count($oRange)) {
-			$aFetchIterator = $this->oImapClient->FetchIterate(array(
+			$aFetchItems = array(
 				FetchType::UID,
 				FetchType::RFC822_SIZE,
 				FetchType::INTERNALDATE,
 				FetchType::FLAGS,
-				FetchType::BODYSTRUCTURE,
+				FetchType::BODYSTRUCTURE
-				$this->getEnvelopeOrHeadersRequestString()
+			);
-			), (string) $oRange, $oRange->UID);
+			if ($this->oImapClient->hasCapability('PREVIEW')) {
+				$aFetchItems[] = FetchType::PREVIEW;
+			}
+			$aFetchItems[] = $this->getEnvelopeOrHeadersRequestString();
+			$aFetchIterator = $this->oImapClient->FetchIterate($aFetchItems, (string) $oRange, $oRange->UID);
 			// FETCH does not respond in the id order of the SequenceSet, so we prefill $aCollection for the right sort order.
 			$aCollection = \array_fill_keys($oRange->getArrayCopy(), null);
 			foreach ($aFetchIterator as /* @var $oFetchResponseItem \MailSo\Imap\FetchResponse */ $oFetchResponseItem) {

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

@@ -41,6 +41,10 @@ class Message implements \JsonSerializable
 		 */
 		$sEmailId = null,
 		$sThreadId = null,
+		/**
+		 * https://www.rfc-editor.org/rfc/rfc8970
+		 */
+		$sPreview = null,
 		// https://autocrypt.org/level1.html#the-autocrypt-header
 		$sAutocrypt = '';
 
@@ -154,7 +158,7 @@ class Message implements \JsonSerializable
 //		$oMessage->sEmailId = $oMessage->sEmailId ?: $oFetchResponse->GetFetchValue('X-GUID');
 		$aThreadId = $oFetchResponse->GetFetchValue(FetchType::THREADID);
 		$oMessage->sThreadId = $aThreadId ? $aThreadId[0] : $oFetchResponse->GetFetchValue('X-GM-THRID');
-
+		$oMessage->sPreview = $oFetchResponse->GetFetchValue(FetchType::PREVIEW) ?: null;
 		$sCharset = $oBodyStructure ? Utils::NormalizeCharset($oBodyStructure->SearchCharset()) : '';
 
 		$sHeaders = $oFetchResponse->GetHeaderFieldsValue();
@@ -461,6 +465,10 @@ class Message implements \JsonSerializable
 			}
 		}
 
+		if (\str_starts_with($oMessage->sSubject, '[Preview]')) {
+			$oMessage->sSubject = \mb_substr($oMessage->sSubject, 10);
+		}
+
 		return $oMessage;
 	}
 
@@ -566,7 +574,9 @@ class Message implements \JsonSerializable
 //			'threadId' => $this->sThreadId,
 //			'mailboxIds' => ['mailboxid'=>true],
 //			'keywords' => $keywords,
-			'size' => $this->iSize
+			'size' => $this->iSize,
+
+			'preview' => $this->sPreview
 		);
 
 		if ($this->DraftInfo) {

snappymail/v/0.0.0/app/templates/Views/Admin/PopupsDomain.html

@@ -128,6 +128,13 @@
 						label: 'STATUS SIZE'
 					}
 				}"></div>
+				<div data-bind="component: {
+					name: 'Checkbox',
+					params: {
+						value: imapDisable_preview,
+						label: 'PREVIEW'
+					}
+				}"></div>
 
 				<h4 data-i18n="POPUPS_DOMAIN/LIMITS"></h4>
 				<div class="control-group">

snappymail/v/0.0.0/app/templates/Views/User/MailMessageList.html

@@ -135,7 +135,7 @@
 			<div class="messageListItem" data-bind="css: lineAsCss()">
 				<div class="messageCheckbox">
 					<div class="checkboxMessage fontastic" data-bind="text: checked() ? '☑' : '☐'"></div>
-				</div><div>
+				</div><div data-bind="attr: {'title':preview}">
 					<div class="flagParent fontastic"></div>
 					<div class="senderParent" data-bind="attr: {'title': senderClearEmailsString}, text: senderEmailsString"></div>
 					<div class="subjectParent" data-bind="text: subject"></div>
@@ -155,7 +155,7 @@
 			<div class="messageListItem" data-bind="css: lineAsCss()">
 				<div class="messageCheckbox">
 					<div class="checkboxMessage fontastic" data-bind="text: checked() ? '☑' : '☐'"></div>
-				</div><div data-bind="attr:{style:indent()}, css:{reply:indent()}">
+				</div><div data-bind="attr:{style:indent(), 'title':preview}, css:{reply:indent()}">
 					<div class="flagParent fontastic"></div>
 					<div class="senderParent" data-bind="attr: {'title': senderClearEmailsString}, text: senderEmailsString"></div>
 					<div class="subjectParent" data-bind="text: subject"></div>