[BUGFIX] FormEngine: Validate human-readable selectMultipleSideBySide…

… field

If a selectMultipleSideBySide field has a "minItems" constraint, the
wrong field gets validated which makes it impossible to store a record if
an affected field would fulfill the constraint after a change.

This patch adds an additional validation for the human-readable field.

Resolves: #93574
Related: #93191
Releases: master, 10.4
Change-Id: I1bb129f809d18a318ac15872bcfef8fdf3db2395
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68316
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>

typo3/sysext/backend/Resources/Public/JavaScript/FormEngine.js

@@ -232,6 +232,7 @@ define(['jquery',
         // execute the phpcode from $FormEngine->TBE_EDITOR_fieldChanged_func
         FormEngine.legacyFieldChangedCb();
         FormEngineValidation.markFieldAsChanged($originalFieldEl);
+        FormEngine.Validation.validateField($fieldEl);
         FormEngine.Validation.validateField($availableFieldEl);
       }