Improved source quality in the test projects

[0x5bfa]

Description

As the title.

Please enable this option to hide space to tab changes.

Motivation and Context

The code quality in the test projects was not as good and so, improved it to be consistent.

• Improve the codebase structure #1806

How Has This Been Tested?

• Build the test projects

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

[marcelwgn]

Are you guys wanting to use Tabs instead of Spaces for indentation in C#? in XAML, I think Tabs is prefered?

We want to stick with what XAML Styler does per default which seems to be spaces for the properties: https://github.com/Xavalon/XamlStyler/wiki/External-Configurations#indent-with-tabs
Plan is to eventually start using XAML Styler for this repo but we are blocked on property ordering issues.

[marcelwgn]

We want to stick with what XAML Styler does

Alright. What about C#?

4 spaces as indicated by the .editorconfig.

we are blocked on property ordering issues.

Does that mean you are finding difficulty to decide how properties should be ordered? Or is that a technical issue in this repo?

The issue is that reordering properties changes behavior: microsoft/microsoft-ui-xaml#10347 (comment)

[0x5bfa]

I think this PR is ready for review.

[marcelwgn]

Thank you for this cleanup!

[marcelwgn]

/azp run