TabView breaks custom titlebar drag region since SDK1.6 #10435
Description
Describe the bug
I was directed here with this issue from stackoverflow.
Adding or removing a tab to the tabview breaks the drag region of a custom title bar.
Every add or remove flips the behaviour as if a boolean is flipped. If it was working, it breaks, and if it was broken, it starts working again.
I tried different versions of the SDK. Bug seems to exist in all versions from 1.6 onwards. Last version of 1.5 does not have the bug.
Steps to reproduce the bug
1: Implement the code below and run.
2: Add a tab
3: Drag region is now broken
4: Add a tab
5: Drag region is now working
6: Repeat steps 2-5
Minimum code to reproduce:
XAML:
<Window
x:Class="TitleBar_Bug_Test.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:TitleBar_Bug_Test"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Title="TitleBar Bug Test">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="48"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<TabView Grid.Row="1" AddTabButtonClick="TabView_AddTabButtonClick"/>
</Grid>
</Window>
C#:
namespace TitleBar_Bug_Test
{
public sealed partial class MainWindow : Window
{
public MainWindow()
{
this.InitializeComponent();
Microsoft.UI.Windowing.AppWindow appWindow = this.AppWindow;
var titleBar = appWindow.TitleBar;
titleBar.ExtendsContentIntoTitleBar = true;
titleBar.PreferredHeightOption = TitleBarHeightOption.Tall;
}
private void TabView_AddTabButtonClick(TabView sender, object args)
{
var newTab = new TabViewItem();
newTab.IconSource = new SymbolIconSource() { Symbol = Symbol.Document };
newTab.Header = "New Page";
// The Content of a TabViewItem is often a frame which hosts a page.
Frame frame = new Frame();
newTab.Content = frame;
frame.Navigate(typeof(TestPage));
sender.TabItems.Add(newTab);
}
}
}
Expected behavior
Drag region of the custom title bar is not affected by the TabView, which has nothing to do with the title bar.
Screenshots
TabViewBug.mp4
NuGet package version
None
Windows version
No response
Additional context
No response