How to duplicate a line with a hotkey

[Aegel5]

I searched for this command in the file AvaloniaEditCommands.cs, but didn't find anything. Can it be added?

[ZSYMAX]

Ctrl+C,Ctrl+V

[Aegel5]

Ctrl+C,Ctrl+V

Absolutly not. With this you need select, copy, move cursor, deselect, paste instead of a simple single hot key. In VS this combination exists and is very usefull.

[KrzysztofDusko]

you can override OnKeyDown method or add appropriate event handler
Ctrl + Shift + D is hotkey in this sample

protected override async void OnKeyDown(KeyEventArgs e)
{
//...
        if (e.HasModifiers(ModifierKeys.Control))
        {
            switch (e.Key)
            {
                case Key.D:
                    if (e.HasModifiers(ModifierKeys.Shift))
                    {
                        EditorHelpers.DoubleSelectedLine(this);
                    }
                    break;
            }
        }
//...
}

    public static void DoubleSelectedLine(TextEditor editor)
    {
        editor.BeginChange();
        var line = editor.Document.Lines[editor.TextArea.Caret.Line - 1];
        string txt = editor.Document.GetText(line.Offset, line.Length);
        editor.Document.Insert(line.EndOffset,"\n"+txt);
        editor.EndChange();
    }