TYPO3 PageTs Hack for gridelement backend layouts

gistfile1.txt

--- a/typo3/sysext/backend/Classes/Form/FormDataProvider/PageTsConfigMerged.php	2020-10-26 14:41:48.000000000 +0100
+++ b/typo3/sysext/backend/Classes/Form/FormDataProvider/PageTsConfigMerged.php	2020-10-26 14:56:45.000000000 +0100
@@ -53,6 +53,21 @@
                     if (!empty($typeSpecificConfiguration[$type . '.']) && is_array($typeSpecificConfiguration[$type . '.'])) {
                         ArrayUtility::mergeRecursiveWithOverrule($newFieldConfiguration, $typeSpecificConfiguration[$type . '.']);
                     }
+					// hack for gridelements begins
+					if ($type === 'gridelements_pi1') {
+						if (!empty($fullFieldConfiguration['types.']['gridelements_pi1.']) &&
+							is_array($fullFieldConfiguration['types.']['gridelements_pi1.']) &&
+							!empty($fullFieldConfiguration['types.']['gridelements_pi1.']['types.']) &&
+							is_array($fullFieldConfiguration['types.']['gridelements_pi1.']['types.']))
+						{
+							$subtype = $result['databaseRow']['tx_gridelements_backend_layout'];
+							$subtypeSpecificConfiguration = $fullFieldConfiguration['types.']['gridelements_pi1.']['types.'];
+							if (!empty($subtypeSpecificConfiguration[$subtype . '.']) && is_array($subtypeSpecificConfiguration[$subtype . '.'])) {
+								ArrayUtility::mergeRecursiveWithOverrule($newFieldConfiguration, $subtypeSpecificConfiguration[$subtype . '.']);
+							}
+						}
+					}
+					// hack for gridelements ends
                 }
                 $mergedTsConfig['TCEFORM.'][$table . '.'][$fieldNameWithDot] = $newFieldConfiguration;
             }

This allows to provide PageTs overrides per grid type:

TCEFORM {
	tt_content {
		# New field label
		header.types.gridelements_pi1.label = Gridelement Header
		# And it's different for tx_gridelements_backend_layout=3
		header.types.gridelements_pi1.types.3.label = Gridelement Header (grid layout = 3)

		# No pi_flexform for CType=gridelements_pi1
		pi_flexform.types.gridelements_pi1.disabled = 1
		# But for tx_gridelements_backend_layout=3 show it!
		pi_flexform.types.gridelements_pi1.types.3.disabled = 0
	}
}