Coordinate the retirement of `generic-drag-and-drop.controller.ts` and all of its remaining consumers by migrating them to the shared Stimulus `sortable-lists` suite on Atlassian Pragmatic Drag and Drop.

The implementation is split into vertical child Work Packages so each surface can be reviewed and verified independently. This parent owns the shared contract, sequencing, and final removal gate.

### Decided contract

#### Move wire

The full move wire is:

* `list_type` — sortable item/list family; Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion * `list_id` — destination list, including empty destinations; and Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion * `prev_id` — relative ordering coordinate. Begin of the insertion

For complete lists, blankEnd of the insertion Begin of the deletion


BlankEnd of the deletion `prev_id` means move to top. Begin of the insertionThe paginated status adapter in #AUTOWORK-285 interprets a blank predecessor as the start of the requested page and validates explicit anchors against global status order.End of the insertion Shared backend helpers reject a nonblank unknown/out-of-scope anchor or a self-reference with 422 and no mutation. Destination changes and reorder persistence are transactional.

Backlogs retains its currently more lenient unknown-anchor behavior; aligning it is tracked by #AGILE-370.

#### Response policy

The suite places rows optimistically in the DOM for every consumer, but server reconciliation is policy-driven:

* these admin/settings consumers retain their existing update/replace component streams and add `method="morph"`; and Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion * Backlogs alone opts into the event-only success response from #AGILE-322 — an event-only turbo-stream carrying `WORK_PACKAGE_MOVED_EVENT`; a bare `204 No Content` was explicitly rejected there because it has no body to carry the event (see https://github.com/opf/openproject/pull/24157). Begin of the insertion

End of the insertion Begin of the deletion


End of the deletion The suite therefore sends `optimistic=true` only when the event-only response contract is explicitly selected.

#### Shared ordering families

* `acts_as_list` consumers use a strict scoped move-after helper. Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion * Array-backed orders use a shared insert-after-key helper. Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion * Resource Planner adapts its custom repack operation to `prev_id`. Begin of the insertion

End of the insertion Begin of the deletion


End of the deletion #### Move menus

Begin of the insertionFor consumers whose move destinations are represented in the loaded rows, server-renderedEnd of the insertion Begin of the deletion Server-renderedEnd of the deletion top/up/down/bottom menu items use #DREAM-775's shared descriptor. Client-side availability gating resolves a `prev_id`, and menu moves use the same persistence request as dragging.

Begin of the insertionPaginated statuses are an explicit exception: #AUTOWORK-285 / https://github.com/opf/openproject/pull/25223 retains server-backed directional menus because they move across page boundaries. Preserve those menus and disable reordering under filters. Its follow-up [DREAM-839](https://community.openproject.org/wp/DREAM-839) changes table presentation without substituting loaded-row-only menu behavior.

End of the insertion ### Child Work Packages

1. #DREAM-786 — core suite/backend extensions plus the complete Project attributes vertical slice. Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion 2. #DREAM-789 — enumerations, user custom field sections, phase definitions, and export templates. Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion 3. #DREAM-790 — user custom fields and built-in attributes. Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion 4. #DREAM-791 — grouped work package types and form configuration. Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion 5. #DREAM-792 — meeting sections and agenda items. Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion 6. #DREAM-793 — manually ordered Resource Planner work packages. Begin of the insertion

End of the insertion Begin of the deletion


End of the deletion Cross-cutting children:

* #DREAM-774 — document the extended DOM and request/response contract. Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion * #DREAM-775 — shared four-direction move-menu descriptor. Begin of the insertion

End of the insertion Begin of the deletion


End of the deletion ### Begin of the insertionAdditional coordinated work

* #AUTOWORK-285 migrates status dragging; it is in review and PR https://github.com/opf/openproject/pull/25223 is open as of 2026-09-14.
* [DREAM-838](https://community.openproject.org/wp/DREAM-838) documents and verifies the shared BorderBoxTable integration. It reuses #DREAM-786's tag-independent row handling and existing component hooks.
* [DREAM-837](https://community.openproject.org/wp/DREAM-837) coordinates the semantic-table migrations deferred by #DREAM-697. Statuses and document types use the shared integration; the three display-only migrations do not gate retirement of the legacy drag controller.
* #DREAM-793 already owns Resource Planner's BorderBoxTable migration to sortable-lists. Keep its persistence and consumer work there.

###End of the insertion Sequencing and relations

Begin of the insertion#DREAM-697End of the insertion Begin of the deletion #DREAM-697's markup migration gates only #DREAM-789 now: its former monolithic PR was split into stacked slices,End of the deletion and Begin of the insertionits four children are closed.End of the insertion Begin of the deletion #DREAM-789 followsEnd of the deletion #DREAM-802 Begin of the insertionhas satisfied #DREAM-789's list-markup prerequisite.End of the insertion Begin of the deletion (phase definitions + export templates).End of the deletion Rich-header surfaces deferred by #DREAM-697 Begin of the insertionremain inEnd of the insertion Begin of the deletion are handled withinEnd of the deletion their own DREAM-671 Begin of the insertionclusters.End of the insertion Begin of the deletion cluster and do not expand the shared BorderBoxList API merely to satisfy this migration.End of the deletion

Begin of the insertion#DREAM-786 (shared coreEnd of the insertion Begin of the deletion The children are sequenced with Follows relations: #DREAM-774End of the deletion and Begin of the insertionProject attributes) and #DREAM-774 (contract documentation) are closed.End of the insertion #DREAM-775 Begin of the deletion follow #DREAM-786,End of the deletion and Begin of the insertion#DREAM-789 through #DREAM-793 remain in specification as of 2026-09-14; their completion has not been inferred from closed prerequisites.

KeepEnd of the insertion Begin of the deletion each remaining cluster follows all three. Recommended order: #DREAM-789, #DREAM-790, #DREAM-791, thenEnd of the deletion the Begin of the insertionexisting sequencing between these clusters. Shared table integration [DREAM-838](https://community.openproject.org/wp/DREAM-838) precedes [DREAM-839](https://community.openproject.org/wp/DREAM-839), [DREAM-840](https://community.openproject.org/wp/DREAM-840)End of the insertion Begin of the deletion high-risk #DREAM-792End of the deletion and Begin of the insertionis coordinated with #DREAM-793. [DREAM-839](https://community.openproject.org/wp/DREAM-839) also follows AUTOWORK-285; [DREAM-840](https://community.openproject.org/wp/DREAM-840) follows DREAM-789's enumeration work. Actual work-package relations must be maintained separately from these description links.End of the insertion Begin of the deletion #DREAM-793 last.End of the deletion

Experiment PR https://github.com/opf/openproject/pull/23893 established that the suite can support the Project attributes surface, but also showed that teaching the frontend an absolute-position wire is the wrong trade. #DREAM-786 salvaged its multi-type list contract, per-type move-URL resolution, leaf-scoped acceptance, and the Project attributes migration itself; the absolute-position mode was discarded.

### Acceptance criteria

* [ ] All six cluster Work Begin of the insertionPackages, #DREAM-774/#DREAM-775, #AUTOWORK-285End of the insertion Begin of the deletion PackagesEnd of the deletion and Begin of the insertionshared table integration [DREAM-838](https://community.openproject.org/wp/DREAM-838)End of the insertion Begin of the deletion #DREAM-774/#DREAM-775End of the deletion are complete.
* [ ] Every former shared-controller consumer uses `sortable-lists` and the decided relative-anchor contract.
* [ ] Admin/settings consumers reconcile through morphing their existing component response boundaries.
* [ ] Directional menu moves and drag moves share one persistence path Begin of the insertionwhere loaded-row anchors express the full move scope; paginated statuses retain the documented server-backed cross-page exception.End of the insertion Begin of the deletion per surface.End of the deletion
* [ ] `generic-drag-and-drop.controller.ts`, its tests, dead position-mode behavior, Angular-service bridge, and consumer wiring are removed.
* [ ] `data-target-container-accessor` is removed from the migrated consumers.
* [ ] No meetings-specific or form-configuration-specific Dragula escape hatch remains.
* [ ] A final inventory confirms no remaining reference to the shared controller.

### Out of scope

* Begin of the insertionDisplay-only table migrations in [DREAM-837](https://community.openproject.org/wp/DREAM-837). Status/document-type presentation follow-ups are tracked there and do not independently block legacy-controller removal once their drag consumers are migrated.

* End of the insertion Backlogs advanced interactions and its existing event-only response contract. Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion * Independent Dragula consumers tracked by #DREAM-785 and #DREAM-787. Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion * Native hierarchy sorting tracked by #DREAM-788. Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion * Angular surfaces tracked by #DREAM-755, #DREAM-756 and its children, and #DREAM-761. Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion * Removal of the Dragula package itself, tracked by #DREAM-762. Begin of the insertion
End of the insertion