Strings::indexOf() ends with ValueError for empty $haystack for negative $nth

[KacerCZ]

Version: 3.2.5
PHP: 8.0.12

Bug Description

Calling method Strings::indexOf() with parameter $haystack being empty string and negative parameter $nth will end with ValueError "strrpos(): Argument #3 ($offset) must be contained in argument #1 ($haystack)".

Steps To Reproduce

Execute following code

$position = \Nette\Utils\Strings::indexOf( '', 'a', -1 );
var_dump( $position );

ValueError is thrown

Expected Behavior

Variable $position contains NULL.