Fixed autocomplete user leak core patch for nc20

 			) {

 				if (strtolower($uid) === $lowerSearch) {

diff --git lib/private/Collaboration/Collaborators/MailPlugin.php lib/private/Collaboration/Collaborators/MailPlugin-new.php

--- lib/private/Collaboration/Collaborators/MailPlugin.php	2021-02-16 14:55:37.281914086 +0100

+++ lib/private/Collaboration/Collaborators/MailPlugin-new.php	2021-02-19 16:22:07.662189199 +0100

--- lib/private/Collaboration/Collaborators/MailPlugin.php	2021-06-22 14:53:24.451402977 +0530

+++ lib/private/Collaboration/Collaborators/MailPlugin-new.php	2021-06-22 14:56:31.201379020 +0530

@@ -36,6 +36,7 @@

 use OCP\IConfig;

 use OCP\IGroupManager;

 use OCP\IUser;

+use OCP\IUserManager;

 use OCP\IUserSession;

 use OCP\Share;

 use OCP\Share\IShare;

@@ -56,12 +57,13 @@

 	/** @var IUserSession */

 		$this->shareeEnumeration = $this->config->getAppValue('core', 'shareapi_allow_share_dialog_user_enumeration', 'yes') === 'yes';

 		$this->shareWithGroupOnly = $this->config->getAppValue('core', 'shareapi_only_share_with_group_members', 'no') === 'yes';

@@ -185,43 +187,79 @@

@@ -185,43 +187,78 @@

 						if ($exactEmailMatch) {

 							$searchResult->markExactIdMatch($emailType);

 						}

-							'name' => $contact['FN'],

-							'type' => $emailAddressType ?? '',

-							'value' => [

-								'shareType' => Share::SHARE_TYPE_EMAIL,

-								'shareType' => IShare::TYPE_EMAIL,

-								'shareWith' => $emailAddress,

-							],

-						];

+						

+						$isUserinInstance = $this->userManager->get($emailAddress);

+						if ($isUserinInstance === null) {

+							// /e/ user is not in ecloud

-							'name' => $contact['FN'],

-							'type' => $emailAddressType ?? '',

-							'value' => [

-								'shareType' => Share::SHARE_TYPE_EMAIL,

-								'shareType' => IShare::TYPE_EMAIL,

-								'shareWith' => $emailAddress,

-							],

-						];