[Sortable] SortableListener uses wrong compareTo check if Comparable is used

[AndreasA]

In https://github.com/doctrine-extensions/DoctrineExtensions/blob/v3.10.0/src/Sortable/SortableListener.php#L266

the sortable listener uses compareTo to find out if the object of the group is matching.

However, the corresponding interface https://github.com/doctrine/common/blob/3.4.3/src/Comparable.php

says it should return 0 upon a match and 1 / -1 according to sorting as that interface could also be used for sorting.

In combination with https://github.com/doctrine-extensions/DoctrineExtensions/blob/main/src/Sortable/SortableListener.php#L275 the sortable listener expects $matches to be a boolean value (or at least 1 and not 0).

see also:

DoctrineExtensions/src/Sortable/SortableListener.php

Line 460 in ea1e025

$matches = $gr == $value;

There was a previous PR #2185 but that was never merged - probably as the one comment was never fixed.