[TASK] Mark render function as deprecated

Render function from SoloFieldContainer class has been
marked as deprecated now. It is not used in core anymore.

Resolves: #76101
Releases: master
Change-Id: I276f6b047b6104863f7f7d6c31a713c4df545fbf
Reviewed-on: https://review.typo3.org/48073

Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>

typo3/sysext/backend/Classes/Form/Container/SoloFieldContainer.php

@@ -32,9 +32,11 @@ class SoloFieldContainer extends AbstractContainer
      * Entry method
      *
      * @return array As defined in initializeResultArray() of AbstractNode
+     * @deprecated since TYPO3 v8, will be removed in TYPO3 v9
      */
     public function render()
     {
+        GeneralUtility::logDeprecatedFunction();
         $table = $this->data['tableName'];
         $fieldToRender = $this->data['singleFieldToRender'];
         $recordTypeValue = $this->data['recordTypeValue'];

typo3/sysext/core/Documentation/Changelog/master/Deprecation-76101-RemoveSoloFieldContainer.rst

+===============================================
+Deprecation: #76101 - remove SoloFieldContainer
+===============================================
+
+Description
+===========
+
+Render function from SoloFieldContainer class has been marked as deprecated now. It is not used in core anymore.
+
+
+Impact
+======
+
+Using the method will trigger a deprecation log entry.
+
+
+Affected Installations
+======================
+
+Instances with custom extensions that use render from SoloFieldContainer.
+
+
+Migration
+=========
+
+Use render method from the ListOfFieldsContainer class.