[BUGFIX] Ensure TSconfig order is identical in BE and FE

Make sure the inclusion order of TSconfig (files and record field)
are identical in BE and FE. As BE and FE use different algorithms,
FE is adjusted to match the BE behaviour, which is the expected one.

Resolves: #84227
Releases: master, 8.7
Change-Id: Idb4afbd736ed65890850ee75d572a55c3a5ab24d
Reviewed-on: https://review.typo3.org/56122
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>

typo3/sysext/frontend/Classes/Controller/TypoScriptFrontendController.php

@@ -3964,10 +3964,14 @@ public function getPagesTSconfig()
         if (!is_array($this->pagesTSconfig)) {
             $TSdataArray = [];
             foreach ($this->rootLine as $k => $v) {
+                // add TSconfig first, as $TSdataArray is reversed below and it shall be included last
+                $TSdataArray[] = $v['TSconfig'];
                 if (trim($v['tsconfig_includes'])) {
                     $includeTsConfigFileList = GeneralUtility::trimExplode(',', $v['tsconfig_includes'], true);
+                    // reverse the includes first to make sure their order is preserved when $TSdataArray is reversed
+                    $includeTsConfigFileList = array_reverse($includeTsConfigFileList);
                     // Traversing list
-                    foreach ($includeTsConfigFileList as $key => $includeTsConfigFile) {
+                    foreach ($includeTsConfigFileList as $includeTsConfigFile) {
                         if (strpos($includeTsConfigFile, 'EXT:') === 0) {
                             list($includeTsConfigFileExtensionKey, $includeTsConfigFilename) = explode(
                                 '/',
@@ -3987,7 +3991,6 @@ public function getPagesTSconfig()
                         }
                     }
                 }
-                $TSdataArray[] = $v['TSconfig'];
             }
             // Adding the default configuration:
             $TSdataArray[] = $GLOBALS['TYPO3_CONF_VARS']['BE']['defaultPageTSconfig'];