The select items of twelve plugin FlexForms were still numbered
<numIndex index="0">/<numIndex index="1"> pairs, and the team members
FlexForm set enableMultiSelectFilterTextfield, which TYPO3 12 removed (the
filter field is always shown now). The core migrated both on the fly on
every request and logged a deprecation each time ("FlexFormTools did an
on-the-fly migration"). The items are converted to <label>/<value> with
Fractor (MigrateItemsIndexedKeysToAssociativeFractor) and the setting is
removed.
The parsed data structures are identical to what the on-the-fly migration
produced, so the backend forms and stored values stay the same.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
frommeandClaude Opus 5.5
b794257f61