Scheduler: fix appointment resizing when grouping by date

[aleksei-semikozov]

No description provided.

[Copilot]

Pull request overview

This PR fixes Scheduler appointment resizing issues in group-by-date mode by computing the resized date range using cell column indexes (instead of relying on cellData.index, which can represent a date index when grouping-by-date repeats columns per group). It also restores correct “reduced-part” behavior (needed for correct resize handles) while explicitly suppressing the reduced icon in group-by-date views.

Changes:

• Refactors horizontal date-range calculation during resizing to correctly find the “right border” cell via column indexes (with RTL support and row-bound clamping).
• Introduces hideReducedIcon for appointment rendering so reduced-part handle logic remains intact while hiding reduced UI in group-by-date workspaces.
• Adds Jest coverage for both the low-level date-range computation and an integration scenario verifying resize handles/reduced UI in group-by-date.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/devextreme/js/__internal/scheduler/appointments/resizing/m_core.ts	Fixes horizontal resize date-range computation by using cell column indexes for left/right border lookup (including RTL).
packages/devextreme/js/__internal/scheduler/appointments/resizing/m_core.test.ts	Adds unit tests covering group-by-date behavior, RTL mirroring, and row-bound clamping for horizontal resizing.
packages/devextreme/js/__internal/scheduler/appointments/m_appointment_collection.ts	Always passes reduced (to preserve reduced-part handle behavior) and introduces hideReducedIcon for group-by-date.
packages/devextreme/js/__internal/scheduler/appointments/appointment/m_types.ts	Extends appointment props with hideReducedIcon.
packages/devextreme/js/__internal/scheduler/appointments/appointment/m_appointment.ts	Adds hideReducedIcon option handling and suppresses reduced rendering when enabled.
packages/devextreme/js/__internal/scheduler/tests/appointments_resizing.test.ts	Adds integration tests ensuring only edge parts have resize handles and reduced UI is not rendered in group-by-date scenarios.