Scheduler - Virtual Scrolling - Support keyboard navigation

[Tucchhaa]

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[Copilot]

Pull request overview

This PR updates the Scheduler’s appointment ordering pipeline to expose a “sorted appointments” list to the appointments collection, enabling deterministic keyboard navigation (Tab/Home/End) in virtual scrolling scenarios, and adds/updates automated tests around this behavior.

Changes:

• Introduces a dedicated sorting stage (sortAppointments) that produces SortedEntity[] and is reused for view model generation and keyboard navigation.
• Refactors workspace → scheduler integration from onRenderAppointments/updateAppointments to renderAppointments.
• Adds/updates QUnit + TestCafe coverage for keyboard navigation, including new E2E scenarios for virtual scrolling.

Reviewed changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
packages/testcafe-models/scheduler/appointment/index.ts	Renames ctor filter param (title → text) used to locate appointments by text.
packages/devextreme/testing/tests/DevExpress.ui.widgets.scheduler/appointments.tests.js	Aligns tests with “real scheduler” items flow and adds getSortedAppointments plumbing.
packages/devextreme/js/__internal/scheduler/workspaces/m_work_space.ts	Renames callback to renderAppointments and updates invocation site.
packages/devextreme/js/__internal/scheduler/workspaces/m_virtual_scrolling.ts	Uses workspace.renderAppointments() when virtual scrolling triggers re-render.
packages/devextreme/js/__internal/scheduler/view_model/types.ts	Introduces SortedEntity type and refactors AppointmentEntity composition.
packages/devextreme/js/__internal/scheduler/view_model/generate_view_model/generate_grid_view_model.ts	Splits sorting into sortAppointments() and updates grid VM generation to accept sorted input.
packages/devextreme/js/__internal/scheduler/view_model/appointments_layout_manager.ts	Stores and exposes sorted items for reuse (sortedItems).
packages/devextreme/js/__internal/scheduler/m_scheduler.ts	Wires getSortedAppointments + scrollTo into appointments config; renames workspace render hook.
packages/devextreme/js/__internal/scheduler/appointments/utils/sorted_index_utils.ts	Removes old DOM-based next/prev focus helpers.
packages/devextreme/js/__internal/scheduler/appointments/utils/sorted_index_utils.test.ts	Removes Jest coverage for the deleted helpers.
packages/devextreme/js/__internal/scheduler/appointments/m_appointments_kbn.ts	Reworks keyboard navigation to use sorted items and support virtual scrolling.
packages/devextreme/js/__internal/scheduler/appointments/m_appointment_collection.ts	Tracks elements by sorted index and preserves focus across re-render during virtual navigation.
e2e/testcafe-devextreme/tests/scheduler/helpers/generateAppointmentsWithResources.ts	Adds helper to generate large grouped datasets for E2E navigation tests.
e2e/testcafe-devextreme/tests/scheduler/common/keyboardNavigation/documentScrollPrevented.ts	Adds E2E checks for preventing document scroll on Home/End.
e2e/testcafe-devextreme/tests/scheduler/common/keyboardNavigation/appointments.ts	Expands E2E coverage for appointment keyboard navigation across scrolling modes.

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