Editor unable to select text programatically

[nk-alex]

Description

I have an Editor displaying a large XML text. I also have an Entry for the user to input the text to serch inside the Editor. What I want to achieve is to select (highlight) the first match of the user input text.

This doesn't seem to be working on Windows. Something like MainThread.BeginInvokeOnMainThread(() => { this.SendedXMLEditor.CursorPosition = 0; this.SendedXMLEditor.SelectionLength = 5; }); on code behind has no effect on the editor:

But if I'm displaying this.SendedXMLEditor.CursorPosition and this.SendedXMLEditor.SelectionLength, and I manually select the editor text, displayed values are correct:

Steps to Reproduce

Link to public reproduction project repository

No response

Version with bug

9.0.100 SR10

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

net9.0-windows10.0.19041.0

Did you find any workaround?

No response

Relevant log output

[nk-alex]

Well, found a way to workaround this "issue". I wrote "issue" since the way it works it makes sense.

Basically, by doing what I was doing (MainThread.BeginInvokeOnMainThread(() => { this.SendedXMLEditor.CursorPosition = 0; this.SendedXMLEditor.SelectionLength = 5; });) I'm not focusing the editor itself, so setting CursorPosition & SelectionLength won't update the UI by highlighting my selection, which makes some sense. My original funcion could workaround this issue by using this extension instead:

public static void SelectText(this Editor editor, int start, int length)
    {
#if WINDOWS
        if (editor.Handler?.PlatformView is TextBox nativeEditor)
        {
            nativeEditor.Focus(FocusState.Programmatic);
            nativeEditor.SelectionStart = start;
            nativeEditor.SelectionLength = length;
        }
#endif
    }

@jfversluis can you confirm this is the expected behaviour? If you believe this is a buggy behaviour I can provide repo.