TYPO3 Core

Inserting the reserved word "--linebreak--" as a "field" in the fieldlist of a palette has no effect in the rendered form of the backend

Suggestion:
In class t3lib_TCEforms - function printPalette($palArr)

change

$out = '<fieldset class="t3-form-palette-fieldset">';
        for ($i = 0; $i <= $row; $i++) {
            $out .= implode($iRow[$i]);
        }
        $out .= '&lt;/fieldset&gt;';

to
$out = '';
for ($i = 0; $i <= $row; $i++) {
$out .= '<fieldset class="t3-form-palette-fieldset">';
$out .= implode($iRow[$i]);
$out .= '</fieldset>';
}

This worked for me, as all fields of a palette left and right of "--linebreak" will be enclosed in their own <fieldset>
(issue imported from #M15640)