For as long back as I have tested (2.91) using "Duplicate Area into New
Window" for Outliner when minimized (showing only header) will result
in an invalid area - at least on Windows. The area may have have a
black background, invalid screen area verts, and has the header on the
bottom. This is because it is created in a window that is our minimum
size but initialized smaller, at the height of the area (0-2 pixels).
This PR just adds a small minimum to our blender window creation.
Pull Request: https://projects.blender.org/blender/blender/pulls/138696
b2c4d71f1d