Breaking: #92118 - TCA ctrl thumbail setting dropped¶
See Issue #92118
The TCA setting
$GLOBALS['TCA'][$aTableName]['ctrl']['thumbnail'] has been dropped.
Setting the control field for a custom table has no effect anymore.
The setting has been used in the list module for tables with image fields to render a preview
of attached images. It has been used for
tt_content in core versions until TYPO3 v7.
There are probably not many extensions using the setting. The list module will
no longer show preview images for rendered rows.
Drop this setting during extension clean up. The setting is simply ignored, no PHP error will be thrown.