Window becomes inactive after DialogHost.Show()

[Mishin870]

Bug explanation

I'm trying to make a preloader using DialogHost (I need to display a loading indicator and lock the application while the data is being loaded)

However, when I call DialogHost.Show(), the application window loses focus

5.0.1-ci571:

bandicam.2024-03-16.22-44-17-543.mp4

if you click on a dialog, the window will become active again along with the dialog.
so they are not mutually exclusive

In my past project I used version 4.6.1 and the window did not lose focus when DialogHost was opened

I tried different versions in the current project:

• 4.10.0-ci317 everything works perfectly
• 5.0.0-ci321 this bug appears

4.10.0-ci317:

bandicam.2024-03-16.23-30-59-746.mp4

How can this be fixed without downgrading to an older version?

My code:

PreloaderDialog

<UserControl x:Class="Client.View.Dialogs.PreloaderDialog"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             mc:Ignorable="d">
    <ProgressBar Width="24"
                 Height="24"
                 Margin="16"
                 IsIndeterminate="True"
                 Style="{StaticResource MaterialDesignCircularProgressBar}"
                 Value="33" />
</UserControl>

MainWindow

<Window x:Class="Client.View.Windows.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
        xmlns:controls="clr-namespace:Client.View.Controls"
        mc:Ignorable="d"
        Title="FriendSync"
        Height="500" Width="540"
        WindowStartupLocation="CenterScreen">
    <materialDesign:DialogHost
        Identifier="RootDialog"
        DialogTheme="Inherit"
        Loaded="DialogHost_OnInitialized">
        ...
    </materialDesign:DialogHost>
</Window>

Method to show preloader

public static async Task DoWithPreloader(Action action, string host = DIALOG_ROOT) {
  var dialog = new PreloaderDialog();

  if (DialogHost.IsDialogOpen(host)) {
    try {
      DialogHost.Close(host);
    } catch (Exception) {
      // ignored
    }
  }

  await DialogHost.Show(dialog, host, new DialogOpenedEventHandler((_, args) => {
    action();
    try {
      if (!args.Session.IsEnded) {
        args.Session.Close(false);
      }
    } catch (Exception) {
      // ignored
    }
  }));
}

Calling code

DialogUtils.DoWithPreloader(() => {
  // some time-consuming code
});

Version

5.0.1-ci571

[MichelMichels]

Can you provide us a test repository which show cases the problem?

[Mishin870]

Here are the two minimal projects inside the solution
They are identical in everything except the MaterialDesign version

DialogHostTest - v5.0.1-ci588, when clicking on any of the buttons the window title becomes inactive

DowngradedTest - v4.10.0-ci317, the window stays active (which is what I want, it looks nice)

https://github.com/Mishin870/DialogHostTest

[MichelMichels]

I pinpointed the issue these lines of code in DialogHost.cs.

This change was introduced by @Keboo in this commit. @Keboo do you remember why these lines were necessary?

[github-actions]

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