TYPO3 Core

When using a FAL/inline configuration inside of flexform, the "Select & upload files" button has no functionality.

Also the console throws errors:

Uncaught Error: Syntax error, unrecognized expression: #data-1-tt_content-NEW5a72d63c613d4814805180-pi_flexform---data---sheet$1tabGeneral---lDEF---settings$1test---vDEF

It seems, that the $1 are the problem, which just occure in 8.7.
In 7.6 those values are splitted by dots. e.g. "sheet.tabGeneral"

I guess this change broke it:

File: typo3/sysext/backend/Classes/Form/Container/InlineControlContainer.php

Before:

data-dropzone-target="#' . htmlspecialchars($this->inlineStackProcessor->getCurrentStructureDomObjectIdPrefix($this->data['inlineFirstPid'])) . '"

After:

data-dropzone-target="#' . htmlspecialchars(StringUtility::escapeCssSelector($currentStructureDomObjectIdPrefix)) . '"