Setting NavigationPage.HasNavigationBar="False" on modally presented NavigationPage causes top padding on iOS

[Axemasta]

Description

If you push a modal page (new NavigationPage(new FooPage())) and set NavigationPage.HasNavigationBar="False" there is a small top padding applied to the content page. This padding is not present when the navigation bar is being displayed.

Originally I thought this was an issue caused somewhere in prism (see #3064) however after upgrading to the latest maui controls & workloads version (8.0.91 controls, 8.0.82/8.0.400.2 workloads) I have noticed the issue got worse (the padding required has gone from 5px to 8px). I have been able to reproduce, in my reproduction the base page has no padding & the modal does:

Landing - non modal page

Modal page, the thin like between the yellow & green should not be there

Steps to Reproduce

1. Navigate modally to a navigation page wrapped content page
2. On the content page set NavigationPage.HasNavigationBar="False"
3. Try and place content at the very top of the content page

Link to public reproduction project repository

https://github.com/Axemasta/NavigationBarPaddingRepro

Version with bug

8.0.91 SR9.1

Is this a regression from previous behavior?

Yes, this used to work in Xamarin.Forms

Last version that worked well

Unknown/Other

Affected platforms

iOS

Affected platform versions

iOS 16+

Did you find any workaround?

Set a negative top padding of -8px:

<ContentPage.Padding>
    <OnPlatform x:TypeArguments="Thickness">
        <!-- <On Platform="iOS" Value="0,-8,0,0" /> -->
    </OnPlatform>
</ContentPage.Padding>

Relevant log output

No response

[Axemasta]

This issue is most likely the same root cause as #20418, however that issue closed without resolution and required prism whereas this issue reproduces the issue outside of prism!

[jaosnz-rep]

I can repro it at iOS platform on the latest 17.11.5(8.0.91&8.0.90).

[kubaflo]

Hi, @Axemasta in my opinion it is not a bug, the pages are correctly placed within their safe area

It looks more like a status bar issue which is not handled by MAUI, but by the Community toolkit

[Axemasta]

Hi, @Axemasta in my opinion it is not a bug, the pages are correctly placed within their safe area

I think you are right, I've checked the sample without the behavior applied and it seems to layout fine. I'll raise it with the MCT team

[kubaflo]

@Axemasta here it is: CommunityToolkit/Maui#2309 :)

[Axemasta]

Oh wow! you are a machine Jakob! 🥳