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SetFocus() change focus order by Tab

See original GitHub issue

Hello,

After applying SetFocus() to TextView the way of switching by Tab elements is changing. For example:

using Terminal.Gui;

namespace UICatalog {
	[ScenarioMetadata (Name: "FocusOrder", Description: "Demonstrate change of focus order after SetFocus()")]
	[ScenarioCategory ("Bug Repro")]
	class FocusOrder : Scenario {
	    class TextFrame : FrameView {
		    private TextView textField;
		    public TextFrame (string title) : base (title) {
			    textField = new TextView () {
				    X = 0,
				    Y = 0,
				    Width = Dim.Fill () - 15,
				    Height = Dim.Fill(),
				    ColorScheme = Colors.Dialog,
				    Text = "0"
			    };
			    var button1 = new Button ("Button 1…") {
				    X = Pos.Right(textField)+1,
				    Y = Pos.Top(textField),
				    Clicked = () => { Button1Handler();}
			    };
			    var button2 = new Button ("Button 2…") {
				    X = Pos.X(button1),
				    Y = Pos.Y(button1)+2,
				    Clicked = () => { Button2Handler();}
			    };
			    Add(textField, button1, button2);
		    }
		    public bool showMessage() {
			    var d =MessageBox.ErrorQuery("Error", "Error", "Ok");
			    this.SetFocus(textField);
			    return true;
		    }
		    private void Button1Handler() {
		    }
		    private void Button2Handler() {
			    showMessage();
		    }
	    }
		public override void Setup () {
		    var tf = new TextFrame ("Frame") {
			    X = 0,
			    Y = 0,
			    Width = Dim.Fill(),
			    Height = Dim.Fill() - 3
		    };
		    var button3 = new Button("Button 3") {
			    X = Pos.Percent(50) - 6,
			    Y = Pos.Bottom(tf) + 1,
		    };
		    Win.Add(tf, button3);
		}
	}
}

When focus changed by “Button 2” to TextView pressing Tab switch focus to “Button 3”. Estimated order is “Button 1”