TYPO3 Core

MaBa, will you work on this still, or why is this assigned to you? If you want to, I propose to come with a solution where the filter field is right above the select box just like you proposed. This has to be configurable per TCA setting as this probably doesn't make sense on every field of that type.

If you don't have time to work on that in the next few months, please unassign from yourself and remove Target Version, as this is not high priority for 6.2 (but indeed a nice-to-have).

Consider that we will be probably postponing feature freeze by some time, so you might be able to make it in time still.

Patch set 1 for branch master has been pushed to the review server.
It is available at https://review.typo3.org/24671

Added the patch and some screenshots.

Example configuration for typo3conf/extTables.php:

$GLOBALS['TCA']['fe_users']['columns']['usergroup']['config']['enableMultiSelectFilterTextfield'] = TRUE;
$GLOBALS['TCA']['fe_users']['columns']['usergroup']['config']['multiSelectFilterItems'] = array(
        array('', 'show all'),
        array('test', 'test'), // LLL: is also supported
);

Applied in changeset dd023e6b1393866cdc8fb37eef52644c2fdcf3db.

Patch set 1 for branch master has been pushed to the review server.
It is available at https://review.typo3.org/24727

Applied in changeset 1f3d603ead078202fac7b0054d7b089033283b6b.