Scheduler - Fix unstable ContextMenu demo test

[Tucchhaa]

No description provided.

[Copilot]

Pull request overview

Fixes instability in the Scheduler “ContextMenu” demo visual test by adjusting how context-menu behavior is wired in the Scheduler workspace and by refactoring demo implementations across frameworks so context menus are configured more deterministically.

Changes:

• Updated Scheduler workspace cell context-menu event binding to attach handlers on specific tables instead of the workspace root.
• Added a Jest regression test to ensure onAppointmentContextMenu fires only once.
• Refactored ContextMenu demos (Angular/Vue/React/jQuery) to use separate context-menu instances per target and re-enabled the demo in the visual-test matrix.

Reviewed changes

Copilot reviewed 18 out of 20 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/devextreme/js/__internal/scheduler/workspaces/m_work_space.ts	Changes where cell context-menu events are bound (date table vs all-day table).
packages/devextreme/js/__internal/scheduler/tests/scheduler.test.ts	Adds regression coverage for duplicate onAppointmentContextMenu calls.
apps/demos/utils/visual-tests/matrix-test-helper.ts	Removes “ContextMenu” from the visual-test skip list for multiple frameworks.
apps/demos/Demos/Scheduler/ContextMenu/jQuery/index.js	Splits into two ContextMenu instances (appointment vs cell) and updates items dynamically.
apps/demos/Demos/Scheduler/ContextMenu/jQuery/index.html	Adds separate context-menu host elements and links demo CSS.
apps/demos/Demos/Scheduler/ContextMenu/jQuery/styles.css	Removes menu-specific CSS rules (keeps badge styling).
apps/demos/Demos/Scheduler/ContextMenu/Vue/App.vue	Splits into two ContextMenu components and item sources; updates grouping toggles.
apps/demos/Demos/Scheduler/ContextMenu/Vue/ItemTemplate.vue	Wraps item template content to stabilize rendering/layout.
apps/demos/Demos/Scheduler/ContextMenu/React/App.tsx	Splits into two ContextMenu components and item sources; uses e.component instead of refs.
apps/demos/Demos/Scheduler/ContextMenu/React/itemTemplate.tsx	Renames template component to a generic ItemTemplate.
apps/demos/Demos/Scheduler/ContextMenu/React/index.html	Links demo CSS.
apps/demos/Demos/Scheduler/ContextMenu/React/styles.css	Removes menu-specific CSS rules (keeps badge styling).
apps/demos/Demos/Scheduler/ContextMenu/ReactJs/App.js	Same split-context-menu refactor for JS React demo.
apps/demos/Demos/Scheduler/ContextMenu/ReactJs/itemTemplate.js	Renames template component to ItemTemplate.
apps/demos/Demos/Scheduler/ContextMenu/ReactJs/index.html	Links demo CSS.
apps/demos/Demos/Scheduler/ContextMenu/ReactJs/styles.css	Removes menu-specific CSS rules (keeps badge styling).
apps/demos/Demos/Scheduler/ContextMenu/Angular/app/app.component.ts	Splits appointment/cell item lists; refactors menu building helpers.
apps/demos/Demos/Scheduler/ContextMenu/Angular/app/app.component.html	Adds two context-menu components (appointment vs cell) with shared template.