🚀 go-pugleaf

I received this error when attempting to create a window with a depth
different from the parent.  When I looked at the dix server code,
I found that the error was generated because I was inheriting the
border pixmap from the parent, even though the pixmap was not used -
the border width was 0.  Specifying a border pixel in the window
attribute structure fixed the problem.

I am guessing that this error is checked because the width can change later?
And that it is illegal to image a pixmap into a window if they have different
depths?

Does this apply to the window background as well?

I did not find anything about this problem in the error discussion in
the paragraphs describing XCreateWindow.  Is this spelled out anywhere?