Fixed Stepper allows incrementing beyond the maximum value

[SubhikshaSf4851]

Root cause:

• The maximum value of the stepper is set when the maximum value is greater than the minimum value. Since the minimum and maximum values are equal, the default value of 100 is applied, which results in the increment button being enabled.
• The minimum value of the stepper is set when the minimum value is lesser than the maximum value. Since the maximum and minimum values are equal, the default value of 0 is applied, which results in the decrement button being enabled.

Description of Change:

• I have changed the maximum value to be set by checking that the maximum value is greater than or equal to the minimum value of the stepper.
• Similarly, for minimum value I have changed it by checking that the maximum value is lesser than or equal to the maximum value of the stepper.
• I have checked the behavior in the native iOS UIStepper and observed that the increment and decrement buttons are disabled.

Tested the behaviour in the following platforms

• Windows
• Android
• iOS
• Mac

Issue Fixed:

Fixes: #28330

Output

Before Issue Fix	After Issue Fix
Issue28330BeforeFix.mp4	Issue28330AfterFix.mp4

[dotnet-policy-service]

Hey there @SubhikshaSf4851! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[jsuarezruiz]

/azp run

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[Copilot]

Pull Request Overview

This PR addresses a bug where the Stepper permitted incrementing beyond its maximum value when the minimum and maximum were equal.

• Changed the validation logic in Stepper.cs to allow maximum and minimum to be equal instead of requiring strict inequality.
• Added/updated test cases in both HostApp and Shared.Tests to verify that increment and decrement actions are disabled when the value equals the boundary.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/Controls/tests/TestCases.HostApp/Issues/Issue28330.cs	Hosts a test page to visually check the stepper’s behavior on various platforms.
src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue28330.cs	Contains automated UI tests ensuring the stepper does not increment or decrement when at its limits.
src/Controls/src/Core/Stepper/Stepper.cs	Updates the validation conditions for Maximum and Minimum properties to allow equality.

[jsuarezruiz]

/azp run

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Azure Pipelines successfully started running 3 pipeline(s).