fix(material/stepper): updates vertical-stepper aria roles #30577
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Updates Angular Component's vertical stepper to use more generic aria roles since having the default tablist/tab/tabpanel applied to the vertical stepper violates WCAG rules of having tabpanel as a nested child within tablist. The new roles of group and region satisfy aria requirements while maintaining the current html structure of the vertical stepper. Fixes b/361783174
Updates previous fix to create individual mat-step-header tags to be used within the horizontal and vertical steppers to make it easier to edit/understand.
Updates previous fix to add aria-expanded attribute to vertical stepper to be more descriptive as to when the associated content is open and the respective step is current.
Updates stepper.spec.ts to check for region role for the vertical stepper based on the new role updates.
Work on fixing failing tests.
Updates stepper.spec.ts to match updated aria-roles for vertical stepper so that it is looking for the appropriate roles/attributes.
Reverts previously changed step-harness files.
Remove unnecessary aria-pressed from vertical stepper.
Updates stepper-harness tests to make checks depending on whether the stepper is horizontal or vertical and checking the attributes accordingly.
Ran command to update api golden checks with new stepper tests.
Updates previous fix to use an ng-template instead of using mat-step-header twice.
…ttern as vertical Updates previous fix so that the aria-roles are cohesive between horizontal/vertical to simplify the patterns.
Updates previous documentation so it uses the correct/updated aria roles of , , and with the attribute.
…les & attributes Updates all tests that are affected by the updated stepper aria roles and attributes.
Ran command to update API goldens.
…pper Updates previous changes to only use aria-expanded for vertical stepper and to add aria-pressed and aria-current values depending on the selectedIndex value.
…utes Updates stepper tests based on the new aria-attributes that were added to the stepper, particularly for the horizontal stepper.
Ran command to update api goldens.
Updates previous changes to tests which used isPressed and isExpanded to simplify to isSelected instead.
…er.ts Updates to add default role of button to material/steppper/step-header.ts
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…testing Updates previous fix to add the data-test-index attribute to the step-header to improve unit testing for all developers working with the stepper.
Updates previous change to change naming convention for index to indicate that it is from/for Material Components.
Ran command to update material api goldens to fix failures.
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Updates Angular Component's vertical stepper to use more generic aria roles since having the default tablist/tab/tabpanel applied to the vertical stepper violates WCAG rules of having tabpanel as a nested child within tablist. The new roles of group and region satisfy aria requirements while maintaining the current html structure of the vertical stepper.
Fixes b/361783174