NavigationPage shows title bar before navigating

[leo-mck]

Description

I am migrating a Xamarin.Forms app to MAUI and in some cases I have a ContentPage with NavigationPage.HasNavigationBar="False" that navigates to a ContentPage with NavigationPage.HasNavigationBar="True". On XF, this works as expected but on MAUI (android) the NavigationPage title bar push the previous page content down before navigating. This is not using shell.

navpage_xf.mp4

navpage_maui.mp4

Here is a frame showing the problem. We are seeing the first page but with the second page title bar.

Steps to Reproduce

No response

Link to public reproduction project repository

No response

Version with bug

8.0.7 SR2

Is this a regression from previous behavior?

Yes, this used to work in Xamarin.Forms

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

No response

[leo-mck]

Here is the project showing the issue

[PureWeen]

This is on some level by design.

In XF every single page had its own toolbar so what's getting pushed is the entire screen with or without a toolbar.

in MAUI the toolbar is part of the chrome, so what we're seeing here is the toolbar hiding/showing as a new page is pushed onto the stack.

In XF you'd get this animation when you pushed where the entire page (including toolbar) would swipe onto the screen, which isn't really desirable.

Shell still does this
#20035

We could probably look at improving the animation or timing of the navbar though so it's less abrasive.

[kevinxufei]

Verified on 17.10.0 Preview 2.0, can repro on android platform with sample project.

[leo-mck]

I just added a project that reproduce this issue above. Here it is again: https://github.com/leo-mck/MauiNavigationPageTestApp