Child window containing TabItem causes application UI to become unresponsive after system unlock

[bianwenbo]

Problem Description

The program's child windows use a tabcontrol containing a tabitem.

When the system is locked and then unlocked, the UI of the child window is no longer responsive.

• OS: Windows 10 19044.1766
• TargetFramework: net6.0-windows

Temporary solutions

1. Clicking the main window restores the child window response. Or...
2. Use raw WPF UI instead of ModernWpf

How to reproduce

Create a new WPF project, here is some sample code:

• MainWindow.xmal

  <Grid>
  <Button x:Name="BtnSubWindow" Content="Open SubWindow" Click="BtnSubWindow_Click"/>
  <Grid>

• MainWindow.xmal.cs

  
  public MainWindow()
  {
  InitializeComponent();
  }

private void BtnSubWindow_Click(object sender, RoutedEventArgs e) { SubWindow subWindow = new(); subWindow.Show(); }

- SubWindow.xmal
```xml
<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*"/>
        <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>
    <TextBox/>
    <TabControl Grid.Column="1">
        <TabItem/>
    </TabControl>
</Grid>