A problem when Korean is typed into a WPF RichTextBox. (Windows11 MS IME)

[akon47]

• .NET Core Version: .NET Core 3.0, .NET Core 3.1, .NET 5.0, .NET 6.0, .NET 7.0
• Windows version: Windows11 (Build: 22623.1037)

• Does the bug reproduce also in WPF for .NET Framework 4.8?: Yes

  Problem description and Actual behavior:

1. After selecting the text, when I type in Korean, the input does not work (NotePad is fine).

2. When typing Hangul (Korean), there is a problem that it stops(lag) and incorrect typing occurs.

Expected behavior:

1. The selected text area should be cleared and replaced with the character I typed.

2. It shouldn't be slow and it types properly.

---

All issues are not reproducible with the option to use the old IME.

[miloush]

I don't think I can reproduce this in a simple text box (though I am on 25267). @akon47 can you provide a repro project?

[akon47]

I don't think I can reproduce this in a simple text box (though I am on 25267). @akon47 can you provide a repro project?

The code in the WPF project I used to reproduce the problem is very simple.

<Window
    x:Class="RichTextBoxIssue.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:RichTextBoxIssue"
    mc:Ignorable="d"
    Title="MainWindow"
    Height="450"
    Width="800"
    >
    <RichTextBox />
</Window>

I will try to reproduce by installing "Windows 11 Insider Preview Build 25267".

[miloush]

OK when using RichTextBox under debugger I managed to get an ArgumentException in TextStore.VerifyCharOffset when typing over selection including end of the text, which probably should not happen. However, it gets swallowed and the text gets written over nevertheless.

I think I can see the lagging, especially if in Debug mode and it correlates with messages of thread exiting.

[akon47]

Any news on this issue?

[akon47]

Any news on this issue? i still have a problem. (Windows11 22H2 (22624.1537) build)

[miloush]

After selecting the text, when I type in Korean, the input does not work (NotePad is fine).

To be clear I did not reproduce this. Can you decsribe which keys you are pressing?

[akon47]

It's very simple to reproduce. I've uploaded a replay using the on-screen keyboard to show you which keys I pressed. It's not that there's a special key, it's that the same problem occurs when you press the key to start any Hangul combination.

[hwankim92]

Any news on this issue?