Ability to turn off "TopPadding" in NavigationView

The WinUI team has completed the spec for this feature

Proposal: Ability to turn off “TopPadding” in NavigationView

Summary

We want to have the NavigationView all the way to the top with ExtendViewIntoTitleBar false. Here is a screenshot of what I want:

Rationale

I looked at the code for this and found that to achieve this I can put a small margin on my NavigationView and it works. I should not have to do this kind of hack to achieve a simple customization like this. The logic can be found in microsoft-ui-xaml/dev/NavigationView/NavigationView.cpp at NeedTopPaddingForRS5OrHigher

Functional Requirements

A property on the NavigationView called something like “EnableAutomaticPadding”

Usage Examples

The default of the property would be true, so to turn it off I could just set it to false.

Release Checklists

Prerelease readiness

• Dev: quality review + code review done
• Dev: test coverage added
• Dev: initial accessibility review done
• Dev: telemetry implemented
• PM: spec up to date
• PM: feature ready for feedback
• PM: docs.microsoft.com updates ready

Stable release readiness

• Dev: feature previously shipped in a prerelease NuGet package
• Dev: Azure CI tests passing
• Dev: accessibility review done
• Dev: API review done
• Dev: IDL attribute switched from preview to public
• Dev: Add test coverage to the NugetReleaseTest test
• PM: spec done
• PM: glob/loc, privacy, security, license compliance ready
• PM: customer validation done
• PM: docs.microsoft.com updated
• PM: Xaml Controls Gallery updated

[YuliKl]

Broadening this feature request slightly. We should provide new ThemeResources for both the TopPadding on NavigationView.Content and HeaderContent margin on NavigationView.Header.

[YuliKl]

Reopening the issue to make sure I update documentation. @RBrid, can you double-check that the Release Checklist is accurate?