C# Windows Forms - Scrollbar on Richtextbox does not show up for a second time

Question

I have a RichTextBoxElement on my form. When I start my application the element looks like this:

After that, I drag the window bigger, that the vertical scrollbar leaves. Picture:

So when I drag the window smaller again, the scrollbar should come back and appear, but it does not. Picture:

Maybe it is helpful to see my properties for this element:

Thanks for help!

Answer 1

I am able to reproduce the issue.

Seems like a bug to me. Notice: if you increase the height of window scrollbar will appears properly, but not when you decrease it.

You can use workaround:

void richTextBox1_SizeChanged(object sender, EventArgs e) => richTextBox1.Refresh();