[FEATURE] save filters in session

https://trello.com/c/PtW89d14/3338-extsgmail-restore-used-filters-after-going-back-eg-inside-the-mail-queue-store-them-inside-a-php-session-also-check-all-other-ba

Classes/Controller/BackendController.php

@@ -31,6 +31,7 @@ use SGalinski\SgJobs\Domain\Repository\JobRepository;
 use SGalinski\SgJobs\Service\BackendService;
 use TYPO3\CMS\Backend\Template\Components\DocHeaderComponent;
 use TYPO3\CMS\Backend\Utility\BackendUtility;
+use TYPO3\CMS\Core\Authentication\BackendUserAuthentication;
 use TYPO3\CMS\Core\Messaging\FlashMessage;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
 use TYPO3\CMS\Extbase\Mvc\Controller\ActionController;
@@ -88,6 +89,14 @@ class BackendController extends ActionController {
 	public function indexAction(array $filters = []): void {
 		$pageUid = (int) GeneralUtility::_GP('id');
 
+		/** @var BackendUserAuthentication $backendUser */
+		$backendUser = $GLOBALS['BE_USER'];
+		if ($filters === []) {
+			$filters = $backendUser->getModuleData('tools_beuser/index.php/web_SgJobsBackend_filters', 'ses') ?: [];
+		} else {
+			$backendUser->pushModuleData('tools_beuser/index.php/web_SgJobsBackend_filters', $filters);
+		}
+
 		// create docheader + buttons
 		$pageInfo = BackendUtility::readPageAccess($pageUid, $GLOBALS['BE_USER']->getPagePermsClause(1));
 		if ($pageInfo === FALSE) {
@@ -136,6 +145,9 @@ class BackendController extends ActionController {
 		$this->view->assign('filters', $filters);
 		$this->view->assign('jobs', $jobs);
 		if (!$totalJobCount && $pageUid) {
+			// clear previously set filters again,
+			// without this, the user would be stuck without filters and just the flash message
+			$backendUser->pushModuleData('tools_beuser/index.php/web_SgJobsBackend_filters', []);
 			$this->addFlashMessage(
 				LocalizationUtility::translate('backend.notice.noRecords', 'SgJobs'), '', FlashMessage::INFO
 			);